Effects of Improved Simulation of Precipitation on Evapotranspiration and Its Partitioning Over Land

Cui, Zhiwen; Wang, Yong; Zhang, Guang J.; Yang, Mingdong; Liu, Jane; Wei, Linyi

doi:10.1029/2021gl097353

Cited by 19 publications

(16 citation statements)

References 45 publications

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“…This could be due to the PDF of rainfall intensity in the ERA5 convection parameterization. To change the rainfall simulation in this region, light‐rain occurrence should be suppressed and heavy‐rain occurrence increased, which has been adopted in the Community Earth System model (Cui et al ., 2022). Our PDF results show that the precipitation below 5 mm/hour and those episodes with short‐lived precipitation are the major precipitation events for the YGC region.…”

Section: Resultsmentioning

confidence: 99%

An observational view of rainfall characteristics and evaluation of ERA5 diurnal cycle in the Yarlung Tsangbo Grand Canyon, China

Chen

Cao

Liu

et al. 2023

Quart J Royal Meteoro Soc

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The Yarlung Tsangbo Grand Canyon (YGC), one of the world's deepest canyons, is located within the East Himalayas, which are remote and poorly instrumented. In this study, a rain gauge network was established around the YGC region. Data collected from the network for more than three years disclose that the rainfall spatial pattern in the south of the YGC region is relatively homogeneous. Diurnal cycles showed some variations among sites, but a clear floor was visible in the afternoon and peak values were exhibited in the early morning.The monthly precipitation in the YGC region shows two peaks, in April and July.There are two regions (500 m and 2,500 m AMSL) with high precipitation in the YGC. For rainfall extremes, vertical convection and vapor transport are important in this region. The diurnal cycle from our observations provides a key test of the physical parameterizations for use in the fifth-generation ECMWF (European Centre for Medium-Range Weather Forecasts) reanalysis product (ERA5).Our observations indicate that ERA5 cannot reproduce the diurnal patterns of precipitation in the YGC region. ERA5 showed a wet bias when estimating light cumulus rainfall and a dry bias when estimating heavier (convective) precipitation. The erroneous diurnal variation of ERA5 precipitation (false afternoon rainfall) was due to the CAPE (Convectively Available Potential Energy)-based convective precipitation scheme. The higher ERA5 precipitation than observed was due to the large-scale rainfall scheme in the Integrated Forecasting System (IFS) of ERA5. These findings indicate that there still is room for improvement of the ERA5 reanalysis data in the eastern Himalaya region.

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Section: Resultsmentioning

confidence: 99%

An observational view of rainfall characteristics and evaluation of ERA5 diurnal cycle in the Yarlung Tsangbo Grand Canyon, China

Chen

Cao

Liu

et al. 2023

Quart J Royal Meteoro Soc

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“…This approach serves as an initial endeavor in developing a new ET partitioning method, though its reliability should be further investigated through sap flux measurements across a range of sites. Such observationally derived plant transpiration data holds great promise as valuable constraints for enhancing model simulations (Cui et al., 2023).…”

Section: Discussionmentioning

confidence: 99%

Investigating Diurnal and Seasonal Cycles of Vegetation Optical Depth Retrieved From GNSS Signals in a Broadleaf Forest

Yao,

Humphrey,

Konings

et al. 2024

Geophysical Research Letters

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Vegetation Optical Depth (VOD) has emerged as a valuable metric to quantify water stress on vegetation's carbon uptake from a remote sensing perspective. However, existing spaceborne microwave remote sensing platforms face limitations in capturing the diurnal VOD variations and global products lack site‐level validation against plant physiology. To address these challenges, we leveraged the Global Navigation Satellite System (GNSS) L‐band microwave signal, measuring its attenuation by the canopy of a temperate broadleaf forest using a pair of GNSS receivers. This approach allowed us to collect continuous VOD observations at a sub‐hourly scale. We found a significant seasonal‐scale correlation between VOD and leaf water potential. The VOD diurnal amplitude is affected by soil moisture, plant transpiration and leaf surface water. Additionally, VOD can help independently estimate plant transpiration. Our findings pave the way for a deeper understanding of response of the vegetation to water stress at finer temporal scales.

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“…In the cases of PDD and HWD, the regressors namely VPD, SH, and LH are considered. ET is a key component in the hydrological cycle that strongly modulates the precipitation intensities over the land (Cui et al, 2022). In this sense, both SH and LH are considered as regressors.…”

Section: Methodsmentioning

confidence: 99%

“…Here, PR acts as primary source of moisture supplier. LH and SH affect transpiration and evaporation, respectively (Alexander, 2011) (Cui et al, 2022). In this sense, both SH and LH are considered as regressors.…”

Section: Relative Importance Metrics Of Lmgmentioning

confidence: 99%

Surface latent and sensible heat trigger flash drought events in India

Das,

Umamahesh

2023

Hydrological Processes

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The flash drought has gained widespread attention as a result of its rapid onset with severe impacts. However, a comprehensive assessment of different flash droughts based on various modulators is not carried out over India to date. Here, we attempt to answer the following research questions, (i) What is the status of different flash drought events due to soil moisture percentile drop (SMPD), standardized evaporative stress ratio (SESR), heat‐wave‐driven (HWD) and precipitation‐deficit‐driven (PDD) in India? (ii) How are these flash droughts distributed across India concerning occurrences, areal coverage, and persistence? (iii) What are the dominant factors that trigger different types of flash droughts? Lindeman, Merenda and Gold (LMG) method is used to examine the dominant factor. We find that PDD flash drought is noticed for the maximum time during 1959–2020. The SMPD flash drought occurrence is observed over northern parts of India. Mostly, Rabi and Zaid seasons experience the incidence of SMPD, SESR, and PDD flash drought conditions. However, HWD flash drought in more than 50% of the states is prominent in the Kharif season. The areal coverage shows a decreasing trend in the cases of SMPD, SESR, and PDD flash drought events. However, HWD flash drought condition has shown an increasing trend. The maximum percentage of SMPD and SESR flash drought events persisted for three to six pentads and five to eight pentads after the onset, respectively. For HWD and PDD flash droughts, most of the events last only for one to two pentads. The sensible heat flux and latent heat flux are responsible for triggering the flash drought events over most of parts in India.

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Effects of Improved Simulation of Precipitation on Evapotranspiration and Its Partitioning Over Land

Cited by 19 publications

References 45 publications

An observational view of rainfall characteristics and evaluation of ERA5 diurnal cycle in the Yarlung Tsangbo Grand Canyon, China

An observational view of rainfall characteristics and evaluation of ERA5 diurnal cycle in the Yarlung Tsangbo Grand Canyon, China

Investigating Diurnal and Seasonal Cycles of Vegetation Optical Depth Retrieved From GNSS Signals in a Broadleaf Forest

Surface latent and sensible heat trigger flash drought events in India

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