SMAP Science and Application Results

Entekhabi, Dara; Yueh, Simon; Bindlish, Rajat; Entin, Jared; Garcia, Mark

doi:10.1109/igarss46834.2022.9884333

Cited by 4 publications

(4 citation statements)

References 68 publications

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“…The global level‐3 36 km SMAP data from 1 April 2015–1 April 2021 are acquired from the National Snow and Ice Data Center archive (Entekhabi et al., 2010). SMAP data collected from 6 AM overpasses and based on the single channel algorithm are used in this study (Entekhabi et al., 2014). Retrievals affected by snow, ice, frozen ground, complex topography, or high vegetation density (vegetation water contented higher than 7 kg/m 2 ) are excluded.…”

Section: Methods and Datamentioning

confidence: 99%

Land Surfaces at the Tipping‐Point for Water and Energy Balance Coupling

Dong

Akbar

Feldman

et al. 2023

Water Resources Research

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Section: Methods and Datamentioning

confidence: 99%

Land Surfaces at the Tipping‐Point for Water and Energy Balance Coupling

Dong

Akbar

Feldman

et al. 2023

Water Resources Research

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“…In addition, SMAP SSM retrievals have been shown to exhibit potential errors in heavily vegetated areas, frozen soils, and regions with the presence of water bodies (Entekhabi et al., 2014; McColl et al., 2017; Wrona et al., 2017). Therefore, we masked SSM retrievals in regions identified as dense vegetation cover (vegetation water content >5 kg/m 2 ), frozen landscapes (surface temperature < 0°C), and the presence of water bodies (water body fraction >5% coverage of a pixel), which is similar to a previous study (McColl et al., 2017).…”

Section: Methodsmentioning

confidence: 99%

Evaluating the Effects of Precipitation and Evapotranspiration on Soil Moisture Variability Within CMIP5 Using SMAP and ERA5 Data

Zhuang

Kim

et al. 2023

Water Resources Research

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Since these processes are complex and show large heterogeneity spatiotemporally, it is hard to quantify all of their resulting impacts on soil moisture. We focus here on the two largest terrestrial water fluxes that are highly related to soil moisture variability: precipitation (Pr), which is the primary water source of soil moisture and also one of the atmospheric forcing variables for land surface processes, and evapotranspiration (ET), which is a primary water cycling process affecting soil moisture.

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“…SMAP is the latest L‐band NASA satellite mission that provides soil moisture in the top 5 cm of the soil at the global scale (Entekhabi et al., 2014). The SMAP radiometer observes the Earth's surface with a near‐polar, Sun‐synchronous 6:00 a.m. (descending)/6:00 p.m. (ascending) orbit.…”

Section: Observational Datasetsmentioning

confidence: 99%

“…Frequently, the role of soil moisture as a driver has been explained in the energy-limited versus moisture-limited framework (e.g., as reviewed in Seneviratne et al, 2010), yet clearly defining the soil moisture limitations is still needed to understand the role of soil moisture limitations on water and carbon fluxes. In January 2015, NASA launched the Soil Moisture Active Passive (SMAP) satellite, developed to address the lack of soil moisture data at broad spatial scales (Entekhabi et al, 2014), providing a unique opportunity to understand surface soil moisture at broad spatial scales. Forested areas are difficult regions for understanding the role of soil moisture, yet they represent one of the most important ecosystem types to understand because of their high throughput of carbon and water.…”

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Can Land Surface Models Capture the Observed Soil Moisture Control of Water and Carbon Fluxes in Temperate‐To‐Boreal Forests?

et al. 2021

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Soil moisture acts as a key driver in the climate system by controlling water and carbon exchange between the surface and the atmosphere (Seneviratne et al., 2010). In vegetated regions, this relationship becomes more complex because vegetation relies on water from its rooting system. As a result, the amount of soil moisture present controls the photosynthetic and evaporative demand of vegetated regions. While other environmental drivers such as temperature and precipitation are often used to explain the exchange of water and carbon, the role of soil moisture and its limiting effect on ecosystem functioning is possibly more fundamental but still very poorly constrained. Therefore, understanding soil moisture-water-carbon interactions is key to understanding regional hydroclimatology and precipitation (Dirmeyer et al., 2009;Seneviratne et al., 2010), as well as understanding the regional and global projections of the terrestrial carbon (Suyker et al., 2003).Terrestrial vegetation mobilizes moisture from the subsurface to the non-woody parts of the plant (e.g., stems and leaves) through its rooting system. Green biomass converts radiant energy to chemical energy through photosynthesis, the process that converts carbon dioxide (CO 2 ) into carbohydrates and new biomass. To draw CO 2 from the atmosphere into the leaf for fixation, leaves have openings on their surface known as stomates. When the stomates open to allow CO 2 into the leaf, water vapor inexorably escapes due to the strong gradient from the nearly saturated environment inside the leaf to the relatively dry atmosphere. This biological process of stomatal control inherently couples the water and carbon cycle when vegetation is present, and it is difficult to examine carbon exchange without understanding the relative role of evapotranspiration and the limitations of soil moisture.In vegetated regions, evapotranspiration (ET) is the sum of evaporation from the ground, evaporation from water stored within the canopy, and transpiration or the release of water from the internal plant tissues

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SMAP Science and Application Results

Cited by 4 publications

References 68 publications

Land Surfaces at the Tipping‐Point for Water and Energy Balance Coupling

Land Surfaces at the Tipping‐Point for Water and Energy Balance Coupling

Evaluating the Effects of Precipitation and Evapotranspiration on Soil Moisture Variability Within CMIP5 Using SMAP and ERA5 Data

Can Land Surface Models Capture the Observed Soil Moisture Control of Water and Carbon Fluxes in Temperate‐To‐Boreal Forests?

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