National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California Soil Moisture Active and.

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National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California Soil Moisture Active and Passive (SMAP) Mission April 2008 National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 2 SMAP Has Focused Science Objectives Primary Science Objectives: Global, high-resolution mapping of soil moisture and its freeze/thaw state to:  Link terrestrial water, energy and carbon cycle processes  Estimate global water and energy fluxes at the land surface  Quantify net carbon flux in boreal landscapes  Extend weather and climate forecast skill  Develop improved flood and drought prediction capability SMAP is one of the four first-tier missions recommended by the NRC Earth Science Decadal Survey Report Soil moisture and freeze/thaw state are primary environmental controls on Evaporation and Net Primary Productivity

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 3 Nominal SMAP Mission Overview Science Measurements  Soil moisture and freeze/thaw state Orbit:  Sun-synchronous, 6 am/6pm nodal crossing  670 km altitude Instruments:  L-band (1.26 GHz) radar  Polarization: HH, VV, HV  SAR mode: 1-3 km resolution (degrades over center 30% of swath)  Real-aperture mode: 30 x 6 km resolution  L-band (1.4 GHz) radiometer  Polarization: V, H, U  40 km resolution  Instrument antenna (shared by radar & radiometer)  6-m diameter deployable mesh antenna  Conical scan at 14.6 rpm  incidence angle: 40 degrees  Creating Contiguous 1000 km swath  Swath and orbit enable 2-3 day revisit Mission Ops duration: 3 years SMAP has significant heritage from the Hydros mission concept and Phase A studies

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 4 “Link Terrestrial Water, Energy and Carbon Cycle Processes” Do Climate Models Correctly Represent the Landsurface Control on Water and Energy Fluxes? What Are the Regional Water Cycle Impacts of Climate Variability? Landscape Freeze/Thaw Dynamics Constrain Boreal Carbon Balance [The Missing Carbon Sink Problem]. Water and Energy Cycle Soil Moisture Controls the Rate of Continental Water and Cycles Carbon Cycle Are Northern Land Masses Sources or Sinks for Atmospheric Carbon? Surface Soil Moisture [% Volume] Measured by L-Band Radiometer Campbell Yolo Clay Field Experiment Site, California Soil Evaporation Normalized by Potential Evaporation

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 5 “Estimate Global Water and Energy Fluxes at the Land Surface” Li et al., (2007): Evaluation of IPCC AR4 soil moisture simulations for the second half of the twentieth century, Journal of Geophysical Research, ΔSM ΔT 0 Relative soil moisture changes (%) in IPCC models for scenario from to SMAP soil moisture observations will help constrain model parameterizations of surface fluxes and improve model performance IPCC models currently exhibit large differences in soil moisture trends under simulated climate change scenarios Projections of summer soil moisture change (ΔSM) show disagreements in Sign among IPCC AR4 models

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 6 “Quantify Net Carbon Flux in Boreal Landscapes” Primary thaw day (DOY) McDonald et al. (2004): Variability in springtime thaw in the terrestrial high latitudes: Monitoring a major control on the biospheric assimilation of atmospheric CO 2 with spaceborne microwave remote sensing. Earth Interactions 8(20), SMAP will complement OCO by providing important information on the land surface processes that control land-atmosphere carbon source/sink dynamics. It will provide more than 8-fold increase in spatial resolution over existing spaceborne sensors. Thaw day difference from multi-year mean (days) Growing season onset from atmospheric CO2 samples (difference from multi-year mean, days) Annual comparison of pan-Arctic thaw date and high latitude growing season onset inferred from atmospheric CO 2 samples, 1988 – 2001 Mean growing season onset for 1988 – 2002 derived from coarse resolution SSM/I data

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 7 “Extend Weather and Climate Forecast Skill” Predictability of seasonal climate is dependent on boundary conditions such as sea surface temperature (SST) and soil moisture – Soil moisture is particularly important over continental interiors. Difference in Summer Rainfall: 1993 (flood) minus 1988 (drought) years Observations Prediction driven by SST and soil moisture Prediction driven by SST Rainfall Difference [mm/day] (Schubert et al., 2002) With Realistic Soil Moisture 24-Hours Ahead High-Resolution Atmospheric Model Forecasts Observed Rainfall 0000Z to 0400Z 13/7/96 (Chen et al., 2001) Buffalo Creek Basin High resolution soil moisture data will improve numerical weather prediction (NWP) over continents by accurately initializing land surface states Without Realistic Soil Moisture

National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 8 “Develop Improved Flood and Drought Prediction Capability” “…delivery of flash-flood guidance to weather forecast offices are centrally dependent on the availability of soil moisture estimates and observations.” “SMAP will provide realistic and reliable soil moisture observations that will potentially open a new era in drought monitoring and decision-support.” Decadal Survey: Current Status: Indirect soil moisture indices are based on rainfall and air temperature (by county or ~30 km) SMAP Capability: Direct soil moisture measurements – global, 3-day, 10 km resolution NOAA National Weather Service Operational Flash Flood Guidance (FFG) Operational Drought Indices Produced by NOAA and National Drought Mitigation Center (NDMC)

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National Aeronautics and Space Administration Jet Propulsion Laboratory California Institute of Technology Pasadena, California 14 Science Enabled by New Measurements What are the priority science uses of the new measurement(s)? –participants may choose to confirm/validate existing science questions/applications and/or may identify new uses What do we need to do scientifically to use these new measurements and/or to get ready for the mission? Are there any major issues to be resolved before this science is enabled, and if so, what are they and what needs to be done?