Reanalysis datasets outperform other gridded climate products in vegetation change analysis in peripheral conservation areas of Central Asia DOI Creative Commons
Harald Zandler,

Thomas Senftl,

Kim André Vanselow

et al.

Scientific Reports, Journal Year: 2020, Volume and Issue: 10(1)

Published: Dec. 31, 2020

Global environmental research requires long-term climate data. Yet, meteorological infrastructure is missing in the vast majority of world's protected areas. Therefore, gridded products are frequently used as only available data source peripheral regions. However, associated evaluations commonly biased towards well observed areas and consequently, station-based datasets. As on vegetation monitoring abilities lacking for regions with poor availability, we analyzed potential several state-of-the-art datasets (CHIRPS, CRU, ERA5-Land, GPCC-Monitoring-Product, IMERG-GPM, MERRA-2, MODIS-MOD10A1) assessing NDVI anomalies (MODIS-MOD13Q1) two particularly suitable remote conservation We calculated 156 variables seasonal periods during 2001-2018, correlated these while taking multiple comparison problem into consideration, computed their spatial performance to derive parameters. Our results showed that four (MERRA-2, MOD10A1, CRU) were analysis both regions, by showing significant correlations controlled at a false discovery rate < 5% more than half Cross-validated variable selection importance assessment based Boruta algorithm indicated high reanalysis ERA5-Land MERRA-2 but higher differences variability between all other products. CHIRPS, GPCC bias-corrected version unsuitable not important provide evidence most spatiotemporally consistent whereas gauge- or satellite-based combinations highly may be applicable

Language: Английский

Flash drought in Australia and its relationship to evaporative demand DOI Creative Commons
Tess Parker, Ailie J. E. Gallant, Mike Hobbins

et al.

Environmental Research Letters, Journal Year: 2021, Volume and Issue: 16(6), P. 064033 - 064033

Published: May 6, 2021

Abstract Flash droughts can be distinguished by rapid intensification from near-normal soil moisture to drought conditions in a matter of weeks. Here, we provide the first characterisation climatology flash across Australia using suite indices. The experiment is designed capture range related drought: evaporative demand describes atmospheric for surface; precipitation, supply atmosphere and stress, surface relative atmosphere. We show that regardless definition, occur all seasons. They terminate as rapidly they start, but some cases last many months, resulting seasonal-scale drought. flash-drought variability its prevalence phases El Niño–Southern Oscillation, highlighting scope prediction. Using case study southeast Australia, monitoring precipitation less useful capturing onset it occurs. Instead, indices like Evaporative Demand Drought Index Stress are more development.

Language: Английский

Citations

68
Reliability of the ERA5 in Replicating Mean and Extreme Temperatures across Europe DOI Open Access
Kondylia Velikou, Georgia Lazoglou, Κωνσταντία Τολίκα

et al.

Water, Journal Year: 2022, Volume and Issue: 14(4), P. 543 - 543

Published: Feb. 11, 2022

ERA5 is widely considered as a valid proxy of observation at region scales. Surface air temperature from the E-OBS database and 196 meteorological stations across Europe are being applied for evaluation fifth-generation ECMWF reanalysis data in period 1981–2010. In general, captures mean extreme temperatures very well reliable climate investigation over Europe. High correlations ranging 0.995 to 1.000 indicate that could capture annual cycle well. However, high biases Root Mean Square Error (RMSE) some European sub-regions (e.g., Alps, Mediterranean) reveal underestimates temperatures. The can be mainly attributed altitude differences between grid points stations. Comparing with other two datasets, presents more small outliers regions southern 40° latitude less areas Black Sea. Scandinavia, frequently than observational ones.

Language: Английский

Citations

59
Disentangling the relative effects of soil moisture and vapor pressure deficit on photosynthesis in dryland Central Asia DOI Creative Commons

Tao Yu,

Guli Jiapaer,

Anming Bao

et al.

Ecological Indicators, Journal Year: 2022, Volume and Issue: 137, P. 108698 - 108698

Published: March 3, 2022

Soil moisture (SM) and vapor pressure deficit (VPD) are key factors affecting photosynthesis, quantifying their effects on this process can help us to understand the mechanisms of carbon cycling in terrestrial ecosystems. However, strong coupling SM VPD makes it difficult quantify relative importance ecosystem cycle. In study we decoupled negative correlation between by sorting binning reanalysed data, based this, quantified relationship sunlight-induced chlorophyll fluorescence (SIF) dryland Central Asia (CA). We found that promoted suppressed photosynthesis CA, accounting for 94.08% 5.92% vegetated areas respectively; CA accounted 39.68% 60.32% vegetation area, respectively. The different types were different: croplands forests tended increase then decrease with increasing SM, grasslands, shrublands sparse SM; croplands, grasslands VPD, while opposite is true vegetation. Relative indicated where had a greater effect than 74.26% mainly central part Kazakhstan Kyrgyzstan, which was related fact main these regions located northern most Uzbekistan Turkmenistan (25.74% areas). Our contributes further understanding processes involved

Language: Английский

Citations

42
West coast India’s rainfall is becoming more convective DOI Creative Commons

A.V. Sreenath,

S. Abhilash, P. Vijaykumar

et al.

npj Climate and Atmospheric Science, Journal Year: 2022, Volume and Issue: 5(1)

Published: May 12, 2022

Abstract A disastrous cloudburst and associated floods in Kerala during the 2019 monsoon season raise hypothesis that rainfall over west coast of India, much which is stratiform, may be trending towards being more convective. As a first exploration, we sought statistically significant differences monthly ERA-5 reanalysis data for between two epochs, 1980–1999 2000–2019. Results suggest convective (deeper, ice-rich) cloud population recent decades, with patterns illustrated spatial maps. Deepening convection, above beyond its trend amount, also indicated by steeper regression slope outgoing longwave radiation trends against precipitation than exhibited interannual variability. Our results are strengthened related manifested direct observations from satellite gauge-based CAPE index balloon soundings data.

Language: Английский

Citations

40
Increasing risk of simultaneous occurrence of flash drought in major global croplands DOI Creative Commons
Shanti Shwarup Mahto, Vimal Mishra

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(4), P. 044044 - 044044

Published: March 30, 2023

Abstract Simultaneous occurrence of flash drought in major croplands can pose challenges for global food security. However, drivers co-occurrence the observed and future climate remain unrecognized. Using observations model simulations, we examine simultaneous droughts 16 that grow wheat, rice, maize. We show significant warming combined with decreasing precipitation led to an increased frequency several during (1981–2020). The many same year has significantly ( p -value = 0.007) 1981–2020 is likely continue. Nine out are projected witness under climate. rise mainly driven by vapor pressure deficit. positive phase El Nino Southern Oscillation influences 10 cropland regions remains a dominating factor future. Enhanced events further enhance croplands, substantial implications production.

Language: Английский

Citations

38
The relative role of soil moisture and vapor pressure deficit in affecting the Indian vegetation productivity DOI Creative Commons
Nivedita Dubey, Subimal Ghosh

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 18(6), P. 064012 - 064012

Published: May 5, 2023

Abstract Atmospheric aridity (vapor pressure deficit, VPD) and soil moisture (SM) deficit limit plant photosynthesis and, thus, affect vegetation carbon uptake. The strong correlation between SM VPD makes it challenging to delineate their relative contributions regional productivity. Addressing this gap is vital understand the future trajectory of productivity in India—the second-highest contributor global greening. Here, we separate controls on Indian using statistical causal analysis. We found that India primarily controlled by limitation (87.66% grids) than (12.34% grids). Vegetation has a varying association with across different agroecological regions India. negative impact uptake not visible high-rainfall areas These findings advance our understanding dynamics under dryness stress can enhance dynamic model estimates for changing climate scenarios.

Language: Английский

Citations

26
Drought Atlas of India, 1901–2020 DOI Creative Commons
Dipesh Singh Chuphal, Anuj Prakash Kushwaha, Saran Aadhar

et al.

Scientific Data, Journal Year: 2024, Volume and Issue: 11(1)

Published: Jan. 2, 2024

India has been considerably affected by droughts in the recent past. Despite considerable impacts of on agriculture and water resources, long-term datasets to examine their consequences at appropriate spatial temporal scales have lacking India. Datasets that provide drought information are mostly available for a short period coarser resolutions, therefore, these do not comprehend regarding major occurred distant past administrative decision-making. To fill this critical gap, we developed high-resolution (0.05°) monthly precipitation temperature 1901-2021 period. We used estimate using standardized evapotranspiration index (SPEI). As SPEI considers role air estimation, it can be meteorological, agricultural, hydrological droughts. Using SPEI, atlas (1901-2020) comprehensive occurrence, impacts, risks

Language: Английский

Citations

12
HERA: a high-resolution pan-European hydrological reanalysis (1950–2020) DOI Creative Commons
Aloïs Tilloy, Dominik Paprotny, Stefania Grimaldi

et al.

Published: Feb. 19, 2024

Abstract. Since 1950, European rivers have been put under increasing pressure by anthropogenic activities, resulting in changes climate, land cover, soil properties and channel morphologies. These evolving environmental conditions can translate into hydrological conditions. The availability of consistent estimates river flow at global continental level is a necessity to assess attribute the cycle. To overcome limitations posed observations (incomplete records, inhomogeneous spatial coverage), we simulate discharge for Europe period 1950–2020 using state-of-the-art modelling approach. We use new set up LISFLOOD model, running 1 arcminute (≈1.8 km) with six-hourly time steps. model forced climate reanalysis data (ERA5-land) bias-corrected downscaled resolution weather observations. also ingests 72 surface fields maps representing catchment morphology, vegetation, properties, use, water demand, lakes reservoirs. Inputs related human activities are through emulate society. Hydrological ReAnalysis (HERA), provides 282 521 pixels upstream area > 100 km2. its skill 2901 gauging stations distributed across Europe. Overall, HERA delivers satisfying results, general weak underestimation observed mean variability. find that performance increases between 1950 2020. fine temporal result an enhanced compared other small-to-medium-scale catchments (100–10 000 km2), degraded remaining small catchments. first long-term, high-resolution Despite limitations, it enables analysis dynamics extremes, influences, change scale while keeping local relevance. It creates opportunity study these ungauged

Language: Английский

Citations

12
Multiscale dynamics of transient merging between western disturbances and monsoonal lows: Connections to the July 2023 flood in Himachal Pradesh DOI
Akash Singh Raghuvanshi, Ankit Agarwal

Atmospheric Research, Journal Year: 2024, Volume and Issue: 304, P. 107401 - 107401

Published: April 4, 2024

Language: Английский

Citations

11
Atmospheric and Land Drivers of Streamflow Flash Droughts in India DOI
Rajesh Singh, Vimal Mishra

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(4)

Published: Feb. 8, 2024

Abstract Streamflow flash droughts (SFDs), characterized by a rapid decline in streamflow over relatively short period, affect water availability, hydropower generation, and the ecosystem. However, atmospheric land processes that drive SFDs monsoonal climate of India remain unexplored. Using observations, reanalysis data sets, model simulations, we examined critical drivers 64 catchments during 1971–2018 period. We identified meteorological (MFDs) using precipitation situ observations simulations streamflow. show deficit anomalous high temperature, driven mainly summer monsoon breaks, lead to development MFDs. Antecedent baseflow conditions play major role propagation MFDs SFDs. Favorable (driven breaks) cause MFDs, which translate High low limit streamflow, controls occurrence drought. On other hand, favorable combined with moderate can trigger season. Moreover, humid are more prone from season India. Understanding crucial assist examining drought implications for resources planning management.

Language: Английский

Citations

9