SMAP soil moisture drying more rapid than observed in situ following rainfall events

Peter J. Shellito, Eric E. Small, Andreas Colliander, Rajat Bindlish, Michael H. Cosh, Aaron A. Berg, David D. Bosch, Todd G. Caldwell, David C. Goodrich, Heather McNairn, John H. Prueger, Patrick J. Starks, Rogier van der Velde, Jeffrey P. Walker

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Abstract

We examine soil drying rates by comparing surface soil moisture observations from the NASA Soil Moisture Active Passive (SMAP) mission to those from networks of in situ probes upscaled to SMAP's sensing footprint. SMAP and upscaled in situ probes record different soil drying dynamics after rainfall. We modeled this process by fitting an exponential curve to 63 drydown events: the median SMAP drying timescale is 44% shorter and the magnitude of drying is 35% greater than in situ measurements. We also calculated drying rates between consecutive observations from 193 events. For 6 days after rainfall, soil moisture from SMAP dries at twice the rate of in situ measurements. Restricting in situ observations to times of SMAP observations does not change the drying timescale, magnitude, or rate. Therefore, observed differences are likely due to differences in sensing depths: SMAP measures shallower soil moisture than in situ probes, especially after rainfall.
Original languageEnglish
Pages (from-to)9068-8075
JournalGeophysical research letters
Volume43
Issue number15
DOIs
Publication statusPublished - 2016

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soil moisture
drying
rainfall
probe
in situ measurement
probes
soils
timescale
in situ
shallow soil
footprints
footprint
soil
rate

Keywords

  • METIS-319781
  • ITC-ISI-JOURNAL-ARTICLE
  • ITC-HYBRID

Cite this

Shellito, P. J., Small, E. E., Colliander, A., Bindlish, R., Cosh, M. H., Berg, A. A., ... Walker, J. P. (2016). SMAP soil moisture drying more rapid than observed in situ following rainfall events. Geophysical research letters, 43(15), 9068-8075. https://doi.org/10.1002/2016GL069946
Shellito, Peter J. ; Small, Eric E. ; Colliander, Andreas ; Bindlish, Rajat ; Cosh, Michael H. ; Berg, Aaron A. ; Bosch, David D. ; Caldwell, Todd G. ; Goodrich, David C. ; McNairn, Heather ; Prueger, John H. ; Starks, Patrick J. ; van der Velde, Rogier ; Walker, Jeffrey P. / SMAP soil moisture drying more rapid than observed in situ following rainfall events. In: Geophysical research letters. 2016 ; Vol. 43, No. 15. pp. 9068-8075.
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abstract = "We examine soil drying rates by comparing surface soil moisture observations from the NASA Soil Moisture Active Passive (SMAP) mission to those from networks of in situ probes upscaled to SMAP's sensing footprint. SMAP and upscaled in situ probes record different soil drying dynamics after rainfall. We modeled this process by fitting an exponential curve to 63 drydown events: the median SMAP drying timescale is 44{\%} shorter and the magnitude of drying is 35{\%} greater than in situ measurements. We also calculated drying rates between consecutive observations from 193 events. For 6 days after rainfall, soil moisture from SMAP dries at twice the rate of in situ measurements. Restricting in situ observations to times of SMAP observations does not change the drying timescale, magnitude, or rate. Therefore, observed differences are likely due to differences in sensing depths: SMAP measures shallower soil moisture than in situ probes, especially after rainfall.",
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Shellito, PJ, Small, EE, Colliander, A, Bindlish, R, Cosh, MH, Berg, AA, Bosch, DD, Caldwell, TG, Goodrich, DC, McNairn, H, Prueger, JH, Starks, PJ, van der Velde, R & Walker, JP 2016, 'SMAP soil moisture drying more rapid than observed in situ following rainfall events' Geophysical research letters, vol. 43, no. 15, pp. 9068-8075. https://doi.org/10.1002/2016GL069946

SMAP soil moisture drying more rapid than observed in situ following rainfall events. / Shellito, Peter J.; Small, Eric E.; Colliander, Andreas; Bindlish, Rajat; Cosh, Michael H.; Berg, Aaron A.; Bosch, David D.; Caldwell, Todd G.; Goodrich, David C.; McNairn, Heather; Prueger, John H.; Starks, Patrick J.; van der Velde, Rogier; Walker, Jeffrey P.

In: Geophysical research letters, Vol. 43, No. 15, 2016, p. 9068-8075.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - SMAP soil moisture drying more rapid than observed in situ following rainfall events

AU - Shellito, Peter J.

AU - Small, Eric E.

AU - Colliander, Andreas

AU - Bindlish, Rajat

AU - Cosh, Michael H.

AU - Berg, Aaron A.

AU - Bosch, David D.

AU - Caldwell, Todd G.

AU - Goodrich, David C.

AU - McNairn, Heather

AU - Prueger, John H.

AU - Starks, Patrick J.

AU - van der Velde, Rogier

AU - Walker, Jeffrey P.

PY - 2016

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N2 - We examine soil drying rates by comparing surface soil moisture observations from the NASA Soil Moisture Active Passive (SMAP) mission to those from networks of in situ probes upscaled to SMAP's sensing footprint. SMAP and upscaled in situ probes record different soil drying dynamics after rainfall. We modeled this process by fitting an exponential curve to 63 drydown events: the median SMAP drying timescale is 44% shorter and the magnitude of drying is 35% greater than in situ measurements. We also calculated drying rates between consecutive observations from 193 events. For 6 days after rainfall, soil moisture from SMAP dries at twice the rate of in situ measurements. Restricting in situ observations to times of SMAP observations does not change the drying timescale, magnitude, or rate. Therefore, observed differences are likely due to differences in sensing depths: SMAP measures shallower soil moisture than in situ probes, especially after rainfall.

AB - We examine soil drying rates by comparing surface soil moisture observations from the NASA Soil Moisture Active Passive (SMAP) mission to those from networks of in situ probes upscaled to SMAP's sensing footprint. SMAP and upscaled in situ probes record different soil drying dynamics after rainfall. We modeled this process by fitting an exponential curve to 63 drydown events: the median SMAP drying timescale is 44% shorter and the magnitude of drying is 35% greater than in situ measurements. We also calculated drying rates between consecutive observations from 193 events. For 6 days after rainfall, soil moisture from SMAP dries at twice the rate of in situ measurements. Restricting in situ observations to times of SMAP observations does not change the drying timescale, magnitude, or rate. Therefore, observed differences are likely due to differences in sensing depths: SMAP measures shallower soil moisture than in situ probes, especially after rainfall.

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JF - Geophysical research letters

SN - 0094-8276

IS - 15

ER -

Shellito PJ, Small EE, Colliander A, Bindlish R, Cosh MH, Berg AA et al. SMAP soil moisture drying more rapid than observed in situ following rainfall events. Geophysical research letters. 2016;43(15):9068-8075. https://doi.org/10.1002/2016GL069946