cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.15468/dl.r984nv
title: Occurrence Download

description: A dataset containing 98 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Acacia wrightii A.Gray, Acacia wrightii Benth.)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 98 records from 19 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025170-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.mch699
title: Occurrence Download

description: A dataset containing 83247199 species occurrences available in GBIF matching the query:
{
 "and" : [
 "BasisOfRecord is Human Observation",
 "Continent is South America",
 "HasCoordinate is true",
 "HasGeospatialIssue is false",
 "OccurrenceStatus is Present",
 "TaxonKey is one of (Testudines, Aves, Amphibia, Crocodylia, Mammalia, Squamata)",
 "Year 1979-2025"
 ]
}

 The dataset includes 83247199 records from 1254 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025140-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.x5wnw7
title: Occurrence Download

description: A dataset containing 1057 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Graptemys versa Stejneger, 1925"
 ]
}

 The dataset includes 1057 records from 34 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025171-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.wsmdzh
title: Ionic Liquid Electrospray Beam Target Performance Characterization

description: Electrospray thruster technology ground testing is of critical importance to their eventual adoption for long duration flight missions. While there has been substantial work to understand the beam physics and plume dynamics of electrospray thrusters and the implications thereof on performance and lifetime, there is a gap in an understanding of facility effects. Interactions with an electrospray plume and the vacuum chamber test facility have implications on both performance and lifetime. Therefore, any effort to characterize an electrospray thruster must be done so with an understanding of how the facility plays a role. In some ways, this is no different than the significant investment that has been made to understand the facility effects for the testing of plasma thrusters. However, there are different challenges involved with the management of positively charged, negatively charged, and neutral particles across a distribution of particle charge and mass as is observed when testing electrospray thrusters in a vacuum chamber. The focus of this paper is a characterization of the secondary particles from the impact with an electrospray beam target for ionic liquid thrusters. Results on secondary current and mass flux are presented with some initial results on secondary time-of-flight measurements. Additionally, modeling results are presented to inform the experimental observations. The results show that mitigating facility effects, while a challenge, can be done with an appropriately designed and biased beam target. If no consideration of facility effects is accounted for when testing electrospray thrusters, performance, reliability, and lifetime can be adversely affected and premature thruster failure may result. The work presented here improves our test capabilities to qualify and acceptance test electrospray thrusters for flight for long duration missions.
DOI: 10.48577/jpl.zadk6g
title: Airborne SAR soil moisture estimates over forests replicating NISAR observations

description: Airborne SAR observations of soil moistureconditions are analyzed over deciduous and evergreenforest in the US Northeast during the 10-day spring and 14-day summer periods in 2022. During the summer, thedynamic range of HH is about 1 dB, deemed associatedmostly with soil moisture changes. Larger changes in  isfound between the two seasons, indicating the vegetationchange, and also in spring when the attenuation by canopyis weak. In spring, the sensitivity of σ0 to soil moisturedecreased in time, suggesting the impact of dryingvegetation. In many sites, σ0 correlates highly with in situsoil moisture, consistently between ascending anddescending viewing geometry on flat terrain and, on slopesonly when imaged at similar incidence angles. Theconsistency benefits NISAR’s retrieval by allowing morefrequent consistent retrievals of soil moisture. The accuracyof soil moisture retrieval from 8 sites is 0.066 m3/m3 inunbiased rmse. The results are very encouraging as anindependent test of the retrieval algorithm under thechallenging conditions of surface slope or forest vegetation.Deficiencies in the retrieval algorithm is represented mostlyas the bias error. In comparison, the temporal range of theretrieval is the most useful property for applications andmatches well with in situ observations.
DOI: 10.48577/jpl.a7ymb0
title: Discrimination of light precipitation from COWVR+TEMPEST, GMI and ATMS passive microwave radiometer observations

description: In the near future, the number of low-cost, small/cubesat-sized passive microwave (MW) radiometric observations available from low Earth orbit (LEO) is expected to increase substantially, especially high frequency (HF) sounders (lowest operating band near 90 GHz). The number of sensors that include the constant-incidence, dual-polarization low (LF) frequency channels (highest operating band near 37 GHz) will remain steady or decline. Physically, the use of HF-only sensors for precipitation skews the precipitation estimates towards indirect, ice-based (scattering) retrievals, rather than the precipitation closer to the surface. Over certain Earth surfaces, a portion of light precipitation (defined as 2 mm hr-1 or less) may remain undetected, which has ramifications for global satellite-based precipitation products. In this manuscript, observations from the smallsat-sized LF Compact Ocean Wind Vector Radiometer (COWVR) and the HF Temporal Experiment for Storms and Tropical Systems (TEMPEST) duo are contrasted with the Global Precipitation Measurement (GPM) Microwave Imager (GMI) and the Advanced Technology Microwave Sounder (ATMS), for discriminating light precipitation over a variety of Earth surface conditions. Precipitation is discriminated using a surface emissivity-based transformation applied to selected channel combinations from each of these sensors, using the GPM Dual Frequency Precipitation Radar (DPR) products as precipitation references. The results highlight the importance of the LF channels for detection of light precipitation over ocean and lightly vegetated surfaces, and 50-GHz temperature channels over heavily vegetated surfaces. For discrimination from TB scenes that encompass mixed water/land fractions, the omission of the COWVR 18 GHz channel mitigates artifacts owing to resolution differences.
DOI: 10.48577/jpl.azwxlu
title: Decoding Global Precipitation Processes and Particle Evolution Using Unsupervised Learning

description: High-quality hydrometeor microphysical observations are essential for accurate precipitation estimates and for evaluating weather and climate models. However, analyzing these properties is challenging due to their high variability, complex interactions, and large data volumes. In this study, we examine over 1.5 million minute-scale rain and snow particle attributes and collocated meteorological variables from seven global measurement sites over nine years. Applying Uniform Manifold Approximation and Projection (UMAP) for nonlinear dimensionality reduction, we reduce the dataset's dimensionality by 75%, identifying nine distinct precipitation groups and associated particle evolution pathways. UMAP effectively captures the global structure of precipitation phases such as rain, snow, and mixed-phase types, revealing clear patterns that linear methods struggle to resolve. The resulting UMAP manifold offers a novel perspective on precipitation phase and intensity, advancing our understanding of particle evolutionary processes and offering valuable insights for improving weather and climate models, and remote sensing precipitation estimates.
DOI: 10.15468/dl.6f5tsa
title: Occurrence Download

description: A dataset containing 746253 species occurrences available in GBIF matching the query:
{
 "DatasetKey" : [
 "is Amplicon sequencing of Tara Oceans DNA samples corresponding to size fractions for protists."
 ]
}

 The dataset includes 746253 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025159-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.48577/jpl.v8ggj8
title: SMAP Validation Experiment 2019-2022 (SMAPVEX19-22): Field Campaign to Improve Soil Moisture and Vegetation Optical Depth Retrievals in Temperate Forests

description: Satellite-based retrieval of forest soil moisture (SM) and vegetation optical depth (VOD) are two long-standing unresolved issues hindering the advances in hydrology, ecology, and Earth system science. A key obstacle is the lack of adequate reference data in forested regions. NASA’s Soil Moisture Active Passive (SMAP) mission, with its partners, conducted the SMAP Validation Experiment 2019-2022 (SMAPVEX19-22) to improve the SMAP SM and VOD retrievals in temperate forests of the northeastern USA. The scope and scale of the campaign exceeded anything that has been done thus far for the development of forest satellite-based SM and VOD retrieval algorithms. The field campaign measured SM, surface conditions, and vegetation properties, with results demonstrating the value of tree sensors with SM measurements and destructive sampling of the vegetation water content of branches and leaves to capture the water distribution in soil and trees. Using low-cost zenith-pointing cameras proved effective in tracking vegetation phenology, aiding the interpretation of brightness temperature (TB). Manual and mobile terrestrial laser scanning measurements captured the three-dimensional forest structure necessary for microwave measurement interpretation. Challenges included characterizing SM in organic forest soils and determining volumetric SM due to spatially variable soil bulk density. Comparisons of the field measurements with SMAP data revealed its ability to retrieve the soil dielectric constant alongside VOD, including the frozen conditions. The findings also indicated that L-band scattering albedo is temporally variable, and the L-band TB is sensitive to deciduous forest leaves, influencing the development of future SM and VOD retrieval algorithms.
DOI: 10.48577/jpl.wujsfs
title: Dynamics of Space-Time TEC Enhancements seen in JPL GIMs: Variations with Latitude, Season and Geomagnetic Activity

description: Total Electron Content (TEC) is central to characterizing ionospheric response to so11 lar and geomagnetic activity. Variations in TEC structures over time provide insight into 12 underlying physical processes and inform monitoring of space weather events, which pose 13 a risk to navigation and communication systems. JPL processed GNSS observations over 14 20 years provide a series of 15-minute Global Ionospheric Maps (GIMs) of spatial res15 olution 1◦×1◦ longitude/latitude. We translate these into geomagnetic coordinates cen16 tered about the sub-solar point and we isolate the top 1% of TEC values in each map 17 to define High Density Regions (HDRs) of TEC. Image processing tools are used to de18 velop an algorithm that detects and tracks these to compile a set of contiguous, uniquely 19 labelled space-time TEC HDRs. We find that HDRs naturally divide into two popula20 tions by peak area, separated by a size of 8.0×106km2, which is around the continen21 tal scale. These populations are studied for different storm conditions - quiet (Kp &lt; 4), 22 moderate (4 ≤ Kp &lt; 7) and extreme (Kp ≥ 7): small HDRs form primarily around 23 four magnetic latitude bands and move roughly parallel to lines of constant magnetic lat24 itude towards later MLT. Large HDRs form around the same latitude bands but follow 25 more complex paths. The statistical nature of these results could be used in predictive 26 ionospheric models and identify reproducible trends on these spatial/temporal scales.
DOI: 10.48577/jpl.r8gjov
title: Chemical, isotopic (O, He, U), and petrological characteristics of a slowly cooled enriched gabbroic shergottite, Northwest Africa 13134

description: Northwest Africa (NWA) 13134 is a coarse-grained gabbro with an oxygen isotopic composition consistent with a Martian origin. It is classified as an enriched shergottite based on its bulk trace element abundances and high bulk La/Yb ratio of 1.53. The meteorite is composed of a framework of large (avg. 6 mm) pyroxene rods (64% by area) with interstitial maskelynite (formerly plagioclase; 28% by area). Minor phases include merrillite and apatite, Fe-Ti oxides, and Fe-sulfides; trace phases include as baddeleyite, tranquillityite, silica, and feldspathoids are observed in evolved mesostasis pockets and partially crystallized magmatic inclusions. Individual pyroxene rods display a distinctive patchy Ca-zoning pattern of juxtaposed low-Ca (pigeonite) and high-Ca (augite) patches with a common crystallographic orientation indicating epitaxial growth. Pigeonite is the volumetrically dominant pyroxene phase (~70% by area) and was the primary liquidus phase, followed closely by augite. Plagioclase crystallized along with the other minor phases from the residual melt between cumulus pyroxene rods. Pyroxenes display ubiquitous exsolution lamellae with typical widths and spacings of 1–2 µm. Sulfide grains are characterized by flame-shaped lamellar intergrowths of hexagonal pyrrhotite (Fe0.90S) and slightly metal-deficient pyrrhotite (Fe¬0.98S), along with minor pentlandite and chalcopyrite. The pyroxene and sulfide microtextures suggest that the gabbro experienced slow and protracted subsolidus cooling. Ilmenite-oxide pairs imply an oxygen fugacity of ~1 log unit below the fayalite-magnetite-quartz buffer at a closure T ≈ 875˚C. Collectively, the texture and bulk composition suggest that NWA 13134 represents a slowly cooled and coarsely crystalline portion of a solidified magma body similar to the source of the enriched basaltic shergottites. Magnetite occurs locally as veins crosscutting pyrrhotite grains and in oxide-phosphate symplectites observed at merrillite-apatite phase boundaries. The presence of magnetite in the sample suggests that at various stages of cooling the gabbro interacted with relatively oxidized fluids, which could be deuteric or exogeneous crustal fluids. A cosmic-ray exposure age of ~2.8–4.0 Ma was calculated based on 3He measured in pyroxene grain separates and overlaps with other shergottites. Finally, we present the first bulk uranium isotope measurement of a Martian meteorite: 238U = –0.220.10‰ and 234Usec = +9.570.35‰. These values indicate slight excesses in heavy U but overlap with the distribution of U isotope compositions of the Earth and other Solar System materials.
DOI: 10.48577/jpl.aespmp
title: Changes in the regional water cycle and their impact on societies

description: Changes in “blue water”, which is the total supply of fresh water available for human extraction over land, are quite closely related to changes in runoff or equivalently precipitation minus evaporation, P – E. This article examines how climate change-driven recent past and future changes in the regional water cycle relate to blue water availability and changes in human blue water demand. Although at the largest scales theoretical and numerical model predictions are in broad agreement with observations, at continental scales and below models predict large ranges of possible future P – E and runoff especially at the scale of individual river catchments and for shorter timescale subseasonal floods and droughts. Nevertheless, it is expected that the occurrence and severity of floods will increase and that that of droughts may increase, possibly compounded by human-driven non-climatic changes such as changes in land use, dam water impoundment, irrigation and extraction of groundwater. Contemporary assessments predict that increases in 21st century human water extraction in many highly-populated regions are unlikely to be sustainable given projections of future P – E. To reduce uncertainty in future predictions, there is an urgent need to improve modeling of atmospheric, land surface and human processes and how these components are coupled. This should be supported by maintaining the observing network and expanding it to improve measurements of land surface, oceanic and atmospheric variables. This includes the development of satellite observations stable over multiple decades and suitable for building reanalysis datasets appropriate for model evaluation.
DOI: 10.48577/jpl.n8g2sm
title: Qualification of additively manufactured polymer fluid manifolds for life-detection instruments

description: The advancement of multiple mission concepts to investigate the subsurface oceans of icy worlds, particularly Titan, Enceladus, and Europa, is driving the development of autonomous life detection instruments. An inherent aspect of this type of instrument is the need for a compact, reliable, and chemically inert internal liquid transport network. Additively manufactured (AM) custom liquid manifolds produced via stereolithography (SLA) methods can meet these constraints. However, before these materials can be considered, basic spaceflight requirements, qualification for flight worthiness and functionality must be addressed. In this study, mechanical properties, outgassing behavior, polymeric characteristics, and chemical compatibility are assessed for select commercially available AM polymers. The results indicate that SLA materials meet basic materials qualification requirements, including sufficiently characterized mechanical properties, the identification of a bakeout protocol for reduced outgassing to meet NASA standards, and chemical compatibility with liquids and reagents used in candidate instrumentation under development for life detection missions.
DOI: 10.48577/jpl.r2dvud
title: Detection of visible-wavelength aurora on Mars

description: Mars hosts a variety of auroral processes despite the planet’s tenuous atmosphere and lack of a global magnetic field. All aurora detections reported to date have been observed at ultraviolet wavelengths from orbit. Here we describe the discovery of visible-wavelength aurora at Mars, originating from the green atomic oxygen line at 557.7 nm. We used near-real-time simulations of a Mars-directed coronal mass ejection (CME), which provided sufficient lead-time to schedule a auroral observation with the SuperCam and Mastcam-Z instruments on the Mars 2020 Perseverance rover. The emission was observed three days after the CME eruption, suggesting the aurora was induced by particles accelerated by the moving shock front. This detection represents the first observation of aurora from any planetary surface other than Earth, the first detection of visible-wavelength aurora at Mars, and demonstrates that auroral forecasting at Mars is possible. During events with higher particle precipitation, or under less dusty atmospheric conditions, aurorae will be visible to future astronauts.
DOI: 10.15468/dl.t7qvnx
title: Occurrence Download

description: A dataset containing 270 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Aeschynomene ciliata Vogel)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 270 records from 61 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025174-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.4yddtm
title: Occurrence Download

description: A dataset containing 0 species occurrences available in GBIF matching the query:
{
 "DatasetKey" : [
 "is Database of Vascular Plants of Canada (VASCAN)"
 ]
}

 The dataset includes 0 records from 0 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025175-250310093411724/datasets/export for details.
DOI: 10.15468/dl.4q9ebd
title: Occurrence Download

description: A dataset containing 2918011 species occurrences available in GBIF matching the query:
{
 "and" : [
 "DatasetKey is EOD – eBird Observation Dataset",
 "PublishingCountry is China"
 ]
}

 The dataset includes 2918011 records from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025129-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.azhvc2
title: Occurrence Download

description: A dataset listing the 618 species recorded in GBIF matching the query:
{
 "DatasetKey" : [
 "is Taiwan Wild Bird Federation Bird Records Database"
 ]
}

 The dataset's 618 records were derived from 1 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025160-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.14942450
title: IODP Expedition 374 Proposal Planning Data

description: Data submitted to the IODP Site Survey Data Bank as part of the planning process for IODP Expedition 374. Only data not available from other repositories or locations are included here. Locations for data in other repositories are indicated in the Metadata cvs file.
DOI: 10.5281/zenodo.14942451
title: IODP Expedition 374 Proposal Planning Data

description: Data submitted to the IODP Site Survey Data Bank as part of the planning process for IODP Expedition 374. Only data not available from other repositories or locations are included here. Locations for data in other repositories are indicated in the Metadata cvs file.
DOI: 10.15468/dl.a9q8ye
title: Occurrence Download

description: A dataset containing 3693 species occurrences available in GBIF matching the query:
{
 "TaxonKey" : [
 "is Alectrurus risora (Vieillot, 1824)"
 ]
}

 The dataset includes 3693 records from 33 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025176-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.15468/dl.ugk2yd
title: Occurrence Download

description: A dataset containing 53 species occurrences available in GBIF matching the query:
{
 "and" : [
 "TaxonKey is one of (Aeschynomene hintonii Sandwith)",
 "HasCoordinate is true",
 "HasGeospatialIssue is false"
 ]
}

 The dataset includes 53 records from 16 constituent datasets; see https://api.gbif.org/v1/occurrence/download/0025178-250310093411724/datasets/export for details.
 
Data from some individual datasets included in this download may be licensed under less restrictive terms.
DOI: 10.5281/zenodo.13772698
title: Data output from Projecting future climate change impacts on the distribution of pelagic squid in the Southern Ocean

description: Data output from Projecting future climate change impacts on the distribution of pelagic squid in the Southern Ocean:Rasters, R models and scripts
DOI: 10.5281/zenodo.13772699
title: Data output from Projecting future climate change impacts on the distribution of pelagic squid in the Southern Ocean

description: Data output from Projecting future climate change impacts on the distribution of pelagic squid in the Southern Ocean:Rasters, R models and scripts