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Research paper thumbnail of Chapter V: Ecosystem

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Research paper thumbnail of Chapter I: Overview

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Research paper thumbnail of Seasonal Dependence of SMAP Radiometer-Based Soil Moisture Performance as Observed Over Core Validation Sites

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium

The NASA SMAP (Soil Moisture Active Passive) mission provides a global coverage of soil moisture ... more The NASA SMAP (Soil Moisture Active Passive) mission provides a global coverage of soil moisture measurements based on its L-band microwave radiometer every 2-3 days at about 40 km resolution. The soil moisture retrieval algorithms model the brightness temperature as a function of soil moisture, surface conditions and vegetation. External data sources inform the algorithms about the surface conditions and vegetation, which enable the retrieval of soil moisture. The inversion process contains uncertainties related to radiometer measurements, forward model assumptions and ancillary data sources. This study focuses on the uncertainties that depend on the seasonal evolution of the surface conditions and vegetation. The study compares the SMAP and core validation site (CVS) soil moisture values over a period of four years to extract the evolution of performance metrics over time. The analysis showed that most CVS that include managed agriculture exhibit significant time-dependent seasonal bias. This bias was linked to seasonal temperature cycle, which is a proxy to several features that can cause seasonally dependent errors in the SMAP product.

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Research paper thumbnail of Assessment of version 4 of the SMAP passive soil moisture standard product

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

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Research paper thumbnail of Assessment of version 4 of the SMAP passive soil moisture standard product

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Jul 1, 2017

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Research paper thumbnail of Development and assessment of the SMAP enhanced passive soil moisture product

Remote Sensing of Environment

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Research paper thumbnail of Observations of Neutral Profiles of Wind Speed and Specific Humidity Above a Gently Rolling Landsurface

Journal of the Meteorological Society of Japan. Ser. II

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Research paper thumbnail of Validation of SMAP surface soil moisture products with core validation sites

Remote Sensing of Environment

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Research paper thumbnail of 동아시아 지역의 플럭스 타워 관측지에 대한 MODIS 위성영상 기반의 증발산 평가

Korean Journal of Agricultural and Forest Meteorology, 2009

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Research paper thumbnail of Climate and Dynamics-D21106-Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements (DOI 10.1029/2004JD004767)

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Research paper thumbnail of NDVI responses to the forest canopy and floor from spring to summer observed by airborne spectrometer in eastern Siberia

Remote Sensing of Environment, 2011

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Research paper thumbnail of Study of roughness lengths and drag coefficients over Nansha sea region, Gobi, desert, Oasis and Tibetan plateau

Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 2000

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Research paper thumbnail of Calculation of near-surface layer turbulent transport and analysis of surface thermal equilibrium features in Nagqu of Tibet

Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 2000

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Research paper thumbnail of An overview of the rangelands atmosphere–hydrosphere–biosphere interaction study experiment in northeastern Asia (RAISE)

Journal of Hydrology, 2007

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Research paper thumbnail of Year-round measurements of net ecosystem CO 2 flux over a montane larch forest in Mongolia

Journal of Geophysical Research, 2005

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Research paper thumbnail of Aircraft observations of the atmospheric boundary layer over a heterogeneous surface in eastern Siberia

Hydrological Processes, 2003

This paper outlines specifications and gives preliminary results of aircraft observations made du... more This paper outlines specifications and gives preliminary results of aircraft observations made during the Intensive Observation Period in 2000 (IOP2000) over the Yakutsk area of eastern Siberia. The observations were part of the GAME-Siberia project. Spatial and seasonal variation in the fluxes of sensible heat, latent heat, and carbon dioxide were determined using a Russian aircraft equipped with turbulence sensors.

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Research paper thumbnail of Eastern Asian hydrometeorology simulation using the Regional Climate System Model

Global and Planetary Change, 1998

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Research paper thumbnail of 2 Response of gross ecosystem productivity, light use efficiency, 3 and water use efficiency of Mongolian steppe 4 to seasonal variations in soil moisture

31 Citation: Li, S.-G., W. Eugster, J. Asanuma, A. Kotani, G. Davaa, D. Oyunbaatar, and M. Sugita... more 31 Citation: Li, S.-G., W. Eugster, J. Asanuma, A. Kotani, G. Davaa, D. Oyunbaatar, and M. Sugita (2008), Response of gross 32 ecosystem productivity, light use efficiency, and water use efficiency of Mongolian steppe to seasonal variations in soil moisture, 33 J. Geophys. ...

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Research paper thumbnail of Soil moisture pulses drive the seasonal variability of steppe productivity in Mongolia

… in Mongolia. Tokyo …, 2006

The Mongolian Plateau lies in a prominent transition belt (between latitudes 41.6–52. 2 oN and lo... more The Mongolian Plateau lies in a prominent transition belt (between latitudes 41.6–52. 2 oN and longitudes 87.6–119.9 oE) that borders the Gobi Desert of central Asia in the south and west, and the Siberian taiga forest in the north. Most of Mongolian territory experiences ...

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Research paper thumbnail of Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau

Boundary-Layer Meteorology, 2007

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Research paper thumbnail of Chapter V: Ecosystem

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Research paper thumbnail of Chapter I: Overview

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Seasonal Dependence of SMAP Radiometer-Based Soil Moisture Performance as Observed Over Core Validation Sites

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium

The NASA SMAP (Soil Moisture Active Passive) mission provides a global coverage of soil moisture ... more The NASA SMAP (Soil Moisture Active Passive) mission provides a global coverage of soil moisture measurements based on its L-band microwave radiometer every 2-3 days at about 40 km resolution. The soil moisture retrieval algorithms model the brightness temperature as a function of soil moisture, surface conditions and vegetation. External data sources inform the algorithms about the surface conditions and vegetation, which enable the retrieval of soil moisture. The inversion process contains uncertainties related to radiometer measurements, forward model assumptions and ancillary data sources. This study focuses on the uncertainties that depend on the seasonal evolution of the surface conditions and vegetation. The study compares the SMAP and core validation site (CVS) soil moisture values over a period of four years to extract the evolution of performance metrics over time. The analysis showed that most CVS that include managed agriculture exhibit significant time-dependent seasonal bias. This bias was linked to seasonal temperature cycle, which is a proxy to several features that can cause seasonally dependent errors in the SMAP product.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of version 4 of the SMAP passive soil moisture standard product

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Assessment of version 4 of the SMAP passive soil moisture standard product

2017 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), Jul 1, 2017

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Development and assessment of the SMAP enhanced passive soil moisture product

Remote Sensing of Environment

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Observations of Neutral Profiles of Wind Speed and Specific Humidity Above a Gently Rolling Landsurface

Journal of the Meteorological Society of Japan. Ser. II

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Validation of SMAP surface soil moisture products with core validation sites

Remote Sensing of Environment

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 동아시아 지역의 플럭스 타워 관측지에 대한 MODIS 위성영상 기반의 증발산 평가

Korean Journal of Agricultural and Forest Meteorology, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Climate and Dynamics-D21106-Turbulent exchange of heat, water vapor, and momentum over a Tibetan prairie by eddy covariance and flux variance measurements (DOI 10.1029/2004JD004767)

Bookmarks Related papers MentionsView impact

Research paper thumbnail of NDVI responses to the forest canopy and floor from spring to summer observed by airborne spectrometer in eastern Siberia

Remote Sensing of Environment, 2011

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Study of roughness lengths and drag coefficients over Nansha sea region, Gobi, desert, Oasis and Tibetan plateau

Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Calculation of near-surface layer turbulent transport and analysis of surface thermal equilibrium features in Nagqu of Tibet

Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of An overview of the rangelands atmosphere–hydrosphere–biosphere interaction study experiment in northeastern Asia (RAISE)

Journal of Hydrology, 2007

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Year-round measurements of net ecosystem CO 2 flux over a montane larch forest in Mongolia

Journal of Geophysical Research, 2005

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Aircraft observations of the atmospheric boundary layer over a heterogeneous surface in eastern Siberia

Hydrological Processes, 2003

This paper outlines specifications and gives preliminary results of aircraft observations made du... more This paper outlines specifications and gives preliminary results of aircraft observations made during the Intensive Observation Period in 2000 (IOP2000) over the Yakutsk area of eastern Siberia. The observations were part of the GAME-Siberia project. Spatial and seasonal variation in the fluxes of sensible heat, latent heat, and carbon dioxide were determined using a Russian aircraft equipped with turbulence sensors.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Eastern Asian hydrometeorology simulation using the Regional Climate System Model

Global and Planetary Change, 1998

Bookmarks Related papers MentionsView impact

Research paper thumbnail of 2 Response of gross ecosystem productivity, light use efficiency, 3 and water use efficiency of Mongolian steppe 4 to seasonal variations in soil moisture

31 Citation: Li, S.-G., W. Eugster, J. Asanuma, A. Kotani, G. Davaa, D. Oyunbaatar, and M. Sugita... more 31 Citation: Li, S.-G., W. Eugster, J. Asanuma, A. Kotani, G. Davaa, D. Oyunbaatar, and M. Sugita (2008), Response of gross 32 ecosystem productivity, light use efficiency, and water use efficiency of Mongolian steppe to seasonal variations in soil moisture, 33 J. Geophys. ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Soil moisture pulses drive the seasonal variability of steppe productivity in Mongolia

… in Mongolia. Tokyo …, 2006

The Mongolian Plateau lies in a prominent transition belt (between latitudes 41.6–52. 2 oN and lo... more The Mongolian Plateau lies in a prominent transition belt (between latitudes 41.6–52. 2 oN and longitudes 87.6–119.9 oE) that borders the Gobi Desert of central Asia in the south and west, and the Siberian taiga forest in the north. Most of Mongolian territory experiences ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Spectral similarity between scalars at very low frequencies in the unstable atmospheric surface layer over the Tibetan plateau

Boundary-Layer Meteorology, 2007

Bookmarks Related papers MentionsView impact

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