# Presentation: 791372

## MODIS Snow and Sea Ice Cover using Moderate Resolution Imaging Spectroradiometer (MODIS) data

***MODIS Snow and Sea Ice Cover using Moderate Resolution Imaging Spectroradiometer (MODIS) data***

**http://snowmelt.gsfc.nasa.gov/MODIS_Snow/modis.html**

***Dorothy K. Hall***
***Hydrological Sciences Branch***
***NASA/GSFC ***
- _[dhall](mailto:dhall@glacier.gsfc.nasa.gov)__[@glacier.](mailto:dhall@glacier.gsfc.nasa.gov)__[gsfc](mailto:dhall@glacier.gsfc.nasa.gov)__[.](mailto:dhall@glacier.gsfc.nasa.gov)__[nasa](mailto:dhall@glacier.gsfc.nasa.gov)__[.](mailto:dhall@glacier.gsfc.nasa.gov)__[gov](mailto:dhall@glacier.gsfc.nasa.gov)_

***July 24, 2002***

## Others Involved in the Project

**Vincent V. Salomonson/NASA/GSFC, ****Team Member**
**George A. Riggs/SSAI Team Leader**** ****(algorithm development, science, programming)**
**Igor Appel/SSAI ****(works with Vince on FSC for 500-m product)**
**Kimberly A. Casey/SSAI ****(Web site, sea ice)**
**Janet Y. L. Chien/GSC ****(image processing, validation)**
**Nicolo E. DiGirolamo/SSAI ****(programming)**
**Andrew G. Klein/Texas A&M ****(snow albedo)**
**Hugh W. Powell/GSC ****(programming)**

**Others Involved in the Project**

## Outline

**Outline**
**Snow Products**
**	****Recent and future enhancements**
**	****Validation activities & status**
**	****	**
**Sea Ice Products**
**	****Validation activities & status**
**	****Future validation efforts**
**Outreach Acitivity - SVS Animation**

## Snow Products

**Snow Products**
**Archived and Distributed by NSIDC**
**http://nsidc.org**
**Daily 500-m resolution swath**
**Daily 500-m resolution tile**
**8-day composite 500-resolution tile**
**Daily climate-modeling grid (CMG)**
**8-day composite CMG**
**Snow albedo – planned for fall 2002**
**Fractional snow cover for 500-m maps - future**

## MODIS climate-modeling grid (CMG) daily snow maps at 0.05° resolution (~5.6 km at the Equator)

**MODIS climate-modeling grid (CMG) daily snow maps at 0.05° resolution (~5.6 km at the Equator)**

## Daily MODIS CMG Snow Map

**Daily MODIS CMG Snow Map**

## The Daily CMG maps show fractional snow cover from 40 - 100% in each pixel

**The Daily CMG maps show fractional snow cover from 40 - 100% in each pixel**

## Eight-Day Composite Global CMG MODIS Snow Map

**March 6-13, 2002                                         **

**Eight-Day Composite Global CMG MODIS Snow Map**

## A thermal mask (>277 K) was instituted in order to eliminate spurious snow cover

**Confusion with sand and clouds and some water bodies is eliminated in Florida and the Bahamas**

**14 Nov 2000**

**Before thermal mask                                                   After...**

**A thermal mask (>277 K) was instituted in order to eliminate spurious snow cover**

## Cloud Masking – Mid-Western U.S.

**The liberal cloud mask result, on the right, results in a 75% increase in snow being mapped, and an 18% decrease in the amount of clouds mapped.  **

**Missouri River**

**Cloud Masking – Mid-Western U.S.**
**November 29, 2001**

## MODIS-IMS Daily Difference Maps

**NOAA Interactive Multisensor Snow and Ice Mapping System (IMS) map showed snow cover in North Dakota and Minnesota and MODIS shows no snow**

**MODIS-IMS Daily Difference Maps**

**Bands 1,4,3**

## MODIS-IMS Daily Difference Maps

**IMS maps showed more extensive snow cover in Missouri and Oklahoma than did the MODIS maps**

**MODIS-IMS Daily Difference Maps**

## For this 8-day period, the MODIS and IMS maps agree more than 80%of the time.     The IMS maps consistently map more snow cover than do the MODIS maps.

**For this 8-day period, the MODIS and IMS maps agree more than 80%of the time.     The IMS maps consistently map more snow cover than do the MODIS maps.**

## MODIS-SSMI Difference Maps

***MODIS-SSMI Difference Maps***

## Results of the MODIS-SSM/I difference maps for the 2001-02 winter

***Results of the MODIS-SSM/I difference maps for the 2001-02 winter***

## Interannual Comparisons

***Interannual Comparisons***
***(8-day composite CMGs show maximum snow cover for the period)***

## Data Assimilation Modeling

**Data Assimilation Modeling**
**MODIS snow daily CMGs are used to correct the modeled snow output in the global Land Data Assimilation System (LDAS)**
**Still in testing mode, but it looks very promising**

## MODIS Sea Ice Maps

**Sea ice extent**
**based on NDSI **
**Ice-surface temperature (IST)**
**split-window technique using MODIS bands 31 and 32 developed by Jeff Key and others**

## MODIS Sea Ice Data Products

**MODIS Sea Ice Data Products**
**Archived and Distributed by NSIDC**
**http://nsidc.org**
**Global, daily and 8-day composite 1-km resolution sea ice cover/IST maps**
**Global daily climate-modeling grid (CMG) products at ~4-km resolution ****beginning late-fall 2002**
**Global 8-day composite Climate-Modeling Grid (CMG) products at ~4-km resolution ****beginning late-fall 2002**

## MODIS IST from an area near the tip of the Antarctic Peninsula

- cloud

**MOD02HKM                                   MOD29 IST**

- navy blue = open water, temperatures greater than 271.5K
- Sea ice surface temperatures ranging from 271.5K (blue) – 233K (yellow) in this color bar

**MODIS IST from an area near the tip of the Antarctic Peninsula**
**April 16, 2002 (fall)**

**ice floe**

## MODIS IST map acquired in the Arctic Ocean west of Greenland

- Greenland

- cloud

**MOD02HKM            ****                                                                          ****MOD29 IST**

**MODIS IST map acquired in the Arctic Ocean west of Greenland**
**April 1, 2002**

## NOAA/NOS CO-OPS Tide Station Prudhoe Bay, AK

**NOAA/NOS CO-OPS Tide Station Prudhoe Bay, AK**
**(NOAA / National Ocean Services Center for Operational Oceanographic Products and Services)**
**  ****Latitude 70****°**** 24.0’N**
**  ****Longitude 148****°**** 31.6’W **

- http://www.co-ops.nos.noaa.gov/co-ops.html

## MOD29 Sea Ice Surface Temperature (IST) Map

- MOD29
- Sea ice surface temperature, 1km
- March 29, 2002   (Day 088)
-    21:45 UTC
- Pixel nearest tide station
- coordinates   =>   248.12 K
- Tide Station Data:
- Air temperature at 2200 UTC
-               -24.9o C, or 248.1 K
- Water temperature at 2200 UTC
-                   6.2o C, or 279.2 K

- Tide Station

**Air temperature = 248.3 K**
**IST of pixel nearest tide station = 248.1 K**

**March 29, 2002 2200 UTC **

**North Slope of Alaska**

**MOD29 Sea Ice Surface Temperature (IST) Map**

## IST Validation Summary

**IST Validation Summary**
**Prudhoe Bay, Alaska, Tide Station**

## Future Validation Opportunity - Sea Ice

**Don Cavalieri/NASA/GSFC, Jim Maslanik/Univ. of Colorado, Matthew Sturm/CRREL, and others**
**Aircraft and Field Experiment March 2003  **
**	****Wallops P3 based in Fairbanks**
**	****AMSR, MODIS, field measurements on sea ice**
**	****IR surface temperature from the aircraft**
**	**

## Product Validation Status

**Product Validation Status**
**Snow and sea ice cover products are validated**
**Ice surface temperature product is Provisional (or Validated at Stage 1 according to the new MODland model)**

## Slide 27