ESA-JAXA Pre-Launch
EarthCARE Science andValidation Workshop
13 – 17 November 2023 | ESA-ESRIN, Frascati(Rome), Italy

Analysis of the radiation budget based on ground-based and satellite
remote sensing observations in the Arctic
Carola Barrientos-Velasco1, Hartwig Deneke1, Anja Hünerbein1, Andreas Macke1, Hannes J. Griesche1, Patric Seifert1
and Matthew Shupe2,3(1) Leibniz Institute for Tropospheric Research, Remote sensing of atmospheric processes, Leipzig, Germany(2) Cooperative Institute for the Research in Environmental Sciences, University of Colorado Boulder, Boulder, Colorado, USA(3) Physical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, Colorado, USAMotivation‘To achieve the objective, the goal is that a retrieved scene with footprint size of 10 km x 10 km
is measured with sufficiently high resolution that the atmospheric vertical profile of solar andterrestrial flux can be reconstructed with an accuracy of 10Wm-2 at the TOA’ [Wehr et al., 2023]

1ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deMotivation‘To achieve the objective, the goal is that a retrieved scene with footprint size of 10 km x 10 km
is measured with sufficiently high resolution that the atmospheric vertical profile of solar andterrestrial flux can be reconstructed with an accuracy of 10Wm-2 at the TOA’ [Wehr et al., 2023]-To better understand the role of clouds on the climate system by investigating their radiative
properties based on remote sensing observations.
- Analyze ground-based and satellite remote sensing observations and products to quantify
radiative biases and derive the radiation budget from two points of view.
- Focus on the unprecedented observations obtained during the Multidisciplinary drifting
Observations for the Study of Arctic Climate (MOSAiC) expedition 2019-2020 and state of the art
1°x1° synergistic products from the Clouds and the Earth's Radiant Energy System (CERES SYN). 1
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deDatasets and Methodology
MOSAiC expedition

Stations during MOSAiC (2020-01-19)

Start date: 2019-09-20 to 2020-10-12

Distance to Polarstern (PS)
Automated Surface Flux Stations (ASFS)
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

2barrientos@tropos.deShipborne atmospheric remote sensing instrumentation

Adapted from H. Griesche
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

3barrientos@tropos.deDatasets and Methodology
ShupeTurner
Micropulse Lidar
Ceilometer
KAZR cloud radar

CERES SYNThe SYN1degEd4.1 provides hourly valuesof upward and downward radiative fluxes at
the BOA, and upward values at the TOA
with a spatial resolution of 1°x1°

MWR HATPRO
Cloud boundaries:
Combined WACR + Micropulse
lidar and ceilometer

Surface fluxes are computed with cloudproperties derived by MODIS, Global
Modeling Assimilation Office Global EarthObserving System GEOS-5 and MOA v 5.4

Interpolated merged radiosondes Surface flux calculations are based on theFu-Liou correlated-k 2/4 stream radiativetransfer model[Shupe et al., 2015, 2022][Minnis et al., 2021]

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

4barrientos@tropos.deDatasets and Methodology
TROPOS Cloud and Aerosol Radiative effect Simulator (T-CARS)[Hersbach et al., 2020]

ShupeTurner+

Ancillary data
ERA51) Radiative closure (RC)Radiative closure (RC) is amethod used to compare
simulated radiative fluxes andobservations to understandthe cloud macro and microphysics retrievals better andpotentially indicate where thesources of relevant uncertainty
reside.

+1D Radiative transfer
model (RRTMG)=Radiative transfer
simulations2) Cloud radiative effect (CRE)
Method used to quantify thedifference between net radiative
fluxes for all-sky atmosphericconditions and those simulated orobserved in the absence of clouds forthe same location and period.

Shipborne and space borne
comparison
The aim of the comparison is
to improve ourunderstanding of the role ofclouds in the Arctic radiationbudget and climate system.

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

5barrientos@tropos.deCase study: 2020-07-13

Radiative flux
comparison at theBOA(Simulations - Observations)

6ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deCase study: 2020-07-13

Radiative flux
comparison at theBOA(Simulations - Observations)

Downward Solar flux (D-Sol)
Bias [Wm-2]

MCITY

ASFS50Sim. ShupeTurner

6.9

4.5

CERES SYN

7.9

5.4

6
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deCase study: 2020-07-13

Radiative flux
comparison at theBOA(Simulations - Observations)

Downward Solar flux (D-Sol)
Bias [Wm-2]

MCITY

ASFS50Sim. ShupeTurner

6.9

4.5

CERES SYN

7.9

5.4

Downward Terrestrial flux (D-Terr)
Bias [Wm-2]

MCITY

ASFS50Sim. ShupeTurner

2.4

1.2

CERES SYN

-6.2

-7.3
6

ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deCase study: 2020-07-13

Radiative flux
comparison at the TOA(Simulations - Observations)

Upward Terrestrial flux (U-Terr)
Bias [Wm-2]

CERES

Sim. ShupeTurner-4.7

7
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deCase study: 2020-07-13

Radiative flux
comparison at the TOA(Simulations - Observations)

Upward Terrestrial flux (U-Terr)
Bias [Wm-2]

CERES

Sim. ShupeTurner-4.7

Upward Solar flux (U-Sol)
Bias [Wm-2]

CERES

Sim. ShupeTurner

17.2
7ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deRadiative flux
comparison at the BOA
Analysis for the entire
MOSAiC period to all
available stations.

Overall good agreementfor Sim. ShupeTurner
simulations and CERESSYN products.

Discrepancies for CERESSYN products during
cloudlessconditions
attributed to different
spatial coverage.
8ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deRadiative flux
comparison at the TOA
Sim. ShupeTurner agree wellwith CERES observations at theTOA.

Largest discrepancies observed
during broken cloud conditions.
1D
radiative
transfer
simulations can’t solve such a
atmospheric conditions.

* Additional attention should
also be given to simulations
under clear-sky conditions.

9ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deRadiative flux
comparison at the BOA
Overall good agreement
for Sim. ShupeTurner
simulations and CERESSYN products.

Mostchallenging
radiative flux comparison
is upward solar radiativeflux at the TOA.

Discrepancies for CERESSYN products during
Cloudlessconditions
attributed to different
spatial coverage

Mean irradiance difference [Wm-2]
for CERES SYN products

10ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deRadiative flux
comparison at the TOA
Sim. ShupeTurner agree well with CERES observations at the TOA.

Largest discrepancies observed during broken cloud conditions. 1D radiative transfer simulations can’tsolve such atmospheric conditions.

* Additional attention should also be given to simulations under clear-sky conditions.

11ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deHourly Cloud Radiative Effect at the BOA

12ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deHourly Cloud Radiative Effect at the TOA

13ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.deSummarySingle-column radiative transfer environment TROPOS Cloud and Aerosol Radiative effectSimulator (T-CARS) is an effective tool to calculate profiles of radiative fluxes, and heating rates
using the radiative solvers like RRTMG and ecRad.

T-CARS can help evaluate cloud macro and microphysical retrievals from a synergistic combinationof active and passive remote sensing observations (e.g., ShupeTurner, Cloudnet, ARM retrievals).

Current study focuses on the MOSAiC expedition. However, its applicability can go beyond theArctic region→ EarthCARE CAL/VAL analysis, several campaigns e.g., CleanCloud, CERTAINTY, etc.).

Several ground-based radiometers are recommended to better understand radiative differences
due to different spatial coverage and further investigate 3D effects.
14ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.de

Thank you for your attention
Questions?

Acknowledge: Bundesministerium für Bildung und Forschung (BMBF)“Combining MOSAiC and Satellite Observations for Radiative Closure and Climate
Implications” (MOSaRiCs) – Project Number 03F0890A
Especial thanks to: MOSAiC and (AC)³ communities
ESA-JAXA Pre-Launch EarthCARE Science and Validation Workshop | 13 – 17 November 2023 | ESA-ESRIN, Frascati (Rome), Italy

barrientos@tropos.de