Spatiotemporal Variations of Evapotranspiration in Amazonia Using the Wavelet Phase Difference Analysis

Zhang, Juan; Feng, Ziyang; Niu, Jie; Mélack, John M.; Zhang, Jin; Qiu, Han; Hu, Bill X.; Riley, William J.

doi:10.1029/2021jd034959

Cited by 5 publications

(2 citation statements)

References 83 publications

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“…The MCD18A1 Version 6.1 was validated against measurements at 142 stations from 6 observational networks and had an RMSE of 39.2 W/m² at daily scale [24]. MCD18A1 has contributed to many fields, such as gross primary production estimation [66], radiative forcing quantification [67], and evaporation estimation [68]. The MCD18A1 Version 6.1 was downloaded from https://search.earthdata.nasa.gov/ (last accessed 29/Jan/2024), and the daily mean DSR was calculated by averaging the DSR estimates every 3 hours.…”

Section: I) Modis Dsr Product (Mcd18a1)mentioning

confidence: 99%

Evaluating Topographic Effects on Kilometer-Scale Satellite Downward Shortwave Radiation Products: A Case Study in Mid-Latitude Mountains

Ma,

He,

Aguilar

et al. 2024

IEEE Trans. Geosci. Remote Sensing

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Downward shortwave radiation (DSR) is critical to many surface processes, and many satellite-derived DSR products have been released. Few studies have validated DSR over mountains where it is highly heterogeneous and so the shortwave flux measured at ground stations does not match kilometer-scale DSR products. To tackle this challenge, we used a high spatial resolution (30 m) daily DSR over Sierra Nevada, Spain for 2008-2015, and a mountainous radiative transfer model to explore how topographic effects impacted the performances of DSR products. Four widely-used satellite products were selected as proxies for our evaluation: (i) MCD18A1 V6.1 (with a spatial resolution of 1 km); (ii) MSG DSR (~ 3.3 km); (iii) GLASS DSR V42 (0.05°); and(iv) BESS DSR (0.05°). There are three main findings under clear skies. Firstly, the product accuracies were slope-dependent, decreasing by 59.8-134.6% with slope ≥ 25° compared to areas with slope < 10°. Secondly, the product accuracies were aspectdependent, exhibiting a higher degree of overestimation (i.e., average of 27.6 W/m² ) on the north side and underestimation (i.e., average of -1.3 W/m² ) on the south side. Thirdly, and finally, the product accuracies were time-dependent, exhibiting seasonal variations and pronounced overestimation in summer (i.e., 8.8 to 18.2 W/m² ). Moreover, the impact of topography decreased with increasing cloud cover. Our findings can be applied to various mountainous areas due to the same mechanism of how topography influences the DSR estimation. This study corroborates the substantial uncertainties of the current DSR products in mountains and the necessity of incorporating topographic information into DSR estimations.

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Section: I) Modis Dsr Product (Mcd18a1)mentioning

confidence: 99%

Evaluating Topographic Effects on Kilometer-Scale Satellite Downward Shortwave Radiation Products: A Case Study in Mid-Latitude Mountains

Ma,

He,

Aguilar

et al. 2024

IEEE Trans. Geosci. Remote Sensing

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“…Groundwater movement in the critical zone, usually defined as the shallow groundwater (between 1-5 m), is important in modulating the terrestrial water-energy distribution and land-atmosphere interactions (Kollet and Maxwell, 2008;Condon and Maxwell, 2019;Fan, 2015). Long term groundwater movement and storage variations are found highly influential in predicting the long-term water and energy partitions across different scales (Wang, 2012;Fang et al, 2016;Zhang et al, 2022). All these factors determine the important role that groundwater is playing in regulating the eco-hydrological processes, especially in the groundwater supplied ecosystems (Chui et al, 2011;Miguez-Macho and Fan, 2012;Subin et al, 2014;Vrettas and Fung, 2017;Fang et al, 2022).…”

mentioning

confidence: 99%

Development of Inter-Grid Cell Lateral Unsaturated and Saturated Flow Model in the E3SM Land Model (v2.0)

Qiu

Bisht

et al. 2023

Preprint

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Abstract. The lateral transport of water in the subsurface is important in modulating the terrestrial water-energy distribution. Although few land surface models have recently included lateral saturated flow within and across grid cells, it is not a default configuration in the Climate Model Intercomparison Project version 6 experiments. In this work, we developed the lateral subsurface flow model with both unsaturated and saturated zones in the Energy Exascale Earth System Model (E3SM) Land Model version 2 (ELMv2.0). The new model, called ELMlat, was benchmarked against PFLOTRAN, a 3D subsurface flow and transport model, for three idealized hillslopes that included a convergent hillslope, divergent hillslope, and titled V-shape hillslope with variably saturated initial conditions. ELMlat showed comparable performance with PFLOTRAN in terms of capturing the dynamics of soil moisture and groundwater table for the three benchmark hillslope problems. Specifically, the mean absolute errors (MAE) of the soil moisture in the top five layers between ELMlat and PFLOTRAN were within 1 % ± 4 % and the MAE of water table depth were within ± 0.3 m. Next ELM_lat was applied to the Little Washita experimental watershed to assess its prediction of groundwater table, soil moisture, and soil temperature. The spatial pattern of simulated groundwater table depth agreed well with the global groundwater table benchmark dataset generated from a global model calibrated with long term observations. The effects of lateral groundwater flow on the energy flux partitioning were more prominent in low land areas with shallower groundwater tables, which the difference of simulated annual surface soil temperature could reach 0.4–0.5 °C at low land areas between ELMv2.0 and ELMlat. Incorporating lateral subsurface flow in ELM improves the representation of the subsurface hydrology which will provide a good basis for future large-scale applications.

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Understanding the shift in drivers of terrestrial water storage decline in the central Inner Mongolian steppe over the past two decades

Zhang,

Wu,

et al. 2024

Journal of Hydrology

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Spatiotemporal Variations of Evapotranspiration in Amazonia Using the Wavelet Phase Difference Analysis

Cited by 5 publications

References 83 publications

Evaluating Topographic Effects on Kilometer-Scale Satellite Downward Shortwave Radiation Products: A Case Study in Mid-Latitude Mountains

Evaluating Topographic Effects on Kilometer-Scale Satellite Downward Shortwave Radiation Products: A Case Study in Mid-Latitude Mountains

Development of Inter-Grid Cell Lateral Unsaturated and Saturated Flow Model in the E3SM Land Model (v2.0)

Understanding the shift in drivers of terrestrial water storage decline in the central Inner Mongolian steppe over the past two decades

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