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

doi:10.1002/2016GL069946

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

Research output: Contribution to journal › Article › Academic › peer-review

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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 language	English
Pages (from-to)	9068-8075
Journal	Geophysical research letters
Volume	43
Issue number	15
DOIs	https://doi.org/10.1002/2016GL069946
Publication status	Published - 2016

Keywords

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

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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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title = "SMAP soil moisture drying more rapid than observed in situ following rainfall events",

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.",

keywords = "METIS-319781, ITC-ISI-JOURNAL-ARTICLE, ITC-HYBRID",

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

year = "2016",

doi = "10.1002/2016GL069946",

language = "English",

volume = "43",

pages = "9068--8075",

journal = "Geophysical research letters",

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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 journal › Article › Academic › peer-review

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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.

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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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