Land surface processes response to warming and wetting trend in Northwest China

Environmental Research Letters, Год журнала: 2024, Номер 19(10), С. 104017 - 104017

Опубликована: Авг. 19, 2024

Abstract The climate in Northwest China (NWC) has undergone a warming and wetting trend (WWT) since the 1980s, which attracted considerable attention from scientific policy communities. However, majority of previous studies have focused on overall effects WWT, very few examined how land surface system responds to or trend, respectively. For this purpose, study uses Community Land Model (CLM5) driven by Chinese Meteorological Forcing Dataset (CMFD) conduct four modeling experiments: control experiment (CTRL) three sensitivity experiments, annual air temperature (NonWarm), precipitation (NonWet), both (NonWWT) are removed CMFD 1979 2018. Compared CTRL, hydrological variables (i.e. soil moisture, runoff evapotranspiration) show visible reduction magnitude, interannual variability, as well NonWet, while they enhanced NonWarm. In NonWarm magnitude net radiation sensible heat fluxes increase, with more pronounced change NonWWT. Further analysis indicates that processes sensitive than trend. Among all energy variables, snow cover fraction most susceptible change. Overall, Ta Pr non-linearly offsetting, budgets superimposed. plays larger impact variability NWC.

Язык: Английский

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Interdecadal Change in the Interannual Relationship Between the Summer Precipitation in the Arid Region of Northwest China With North African Subtropical High and Western Pacific Subtropical High

International Journal of Climatology, Год журнала: 2025, Номер unknown

Опубликована: Янв. 1, 2025

ABSTRACT The zonal movement of both the western Pacific subtropical high (WPSH) and North African (NASH) correlates well with summer precipitation in arid region Northwest China (ARNWC), but there is not enough understanding interdecadal change interannual relationship between position linkage two highs ARNWC under different backgrounds. Based on observed data at 101 stations ARNWC, NCEP–NCAR reanalysis data, Hadley Centre surface sea temperature (SST) for 1961–2022, investigated. Results show that has experienced distinct periods (dry period: 1961–1986; wet 1987–2022), eastern part dry period Tarim Basin period, respectively. When NASH WPSH move opposite directions, water vapour directly (indirectly) transported from Asian monsoon (tropical Indo‐Pacific Ocean) (wet) period. Asian‐Pacific Oscillation (APO) warm pool contribute to only SST plays an important role modulating WPSH.

Язык: Английский

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Potential Impacts of the North Atlantic Horseshoe Pattern on China Compound Heat‐Humidity Extremes

International Journal of Climatology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 26, 2025

ABSTRACT Compound heat‐humidity extremes (CHHEs) have gained significant attention as crucial indicators of heat stress. This research investigates the summer wet bulb globe temperature (WBGT) to elucidate spatial variation CHHEs across China from 1961 2022. The results reveal a clear increase in CHHEs, with highest WBGT observed southeastern China, while increases are noted northwestern and northeastern regions. Empirical orthogonal function analysis identifies three leading patterns: consistent increase, north (decreasing)–south (increasing) dipole, west (decreasing)–east dipole. Both observations model simulations indicate that North Atlantic Horseshoe (NAH) sea surface (SST) anomaly pattern is reliable predictor for via influencing Oscillation (NAO) modulating large‐scale circulations. combined westward extension Western Pacific Anomalous Anticyclone (WNPAC), leads rise particularly Central China. Regarding north–south air‐sea interactions driven by NAH reinforce negative phase Eurasian (EU) teleconnection through NAO, intensifying cyclonic anticyclonic anomalies over Mongolia northern southern respectively. Furthermore, during May–July effectively predicts dipole variations using genetic algorithm‐based evolving neural network. offers valuable insights predicting perspective SST anomalies.

Язык: Английский

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Synergistic Influence of Eurasian Soil Moisture and Pacific Sea Surface Temperature Anomalies on August Out‐Of‐Phase Precipitation Pattern in Northern China

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(5)

Опубликована: Март 5, 2025

Abstract This study delves into the interannual variability of August precipitation in northern China, revealing that leading mode exhibits a zonal out‐of‐phase pattern, with dividing line around 100°E. The western region (WNC) serves as positive anomaly center, contrasting eastern (ENC) negative center. disparity is largely due to dynamic and moisture conditions between these regions, influenced by quasi‐barotropic anomalous cyclonic circulation over Central Asia anticyclonic Mongolia. Further analysis reveals land oceanic processes are pivotal modulating this pattern. Specifically, soil anomalies Eurasia sea surface temperature (SST) central Pacific critical. In August, Eurasian influence local thermal processes, eastward‐propagating Rossby wave circulations. Simultaneously, SST initiate an meridional Pacific‐Japan (PJ) train. These induce opposing promote WNC suppress it ENC, thus establishing observed our study, contribute approximately 44.9% 21.2%, respectively, linear variance collectively accounting for 54.8% variation. investigation required gain deeper understanding phenomenon.

Язык: Английский

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Changes in Vegetation Phenology and Water Use Efficiency Driven by Warming and Wetting in Northwest China

Hydrological Processes, Год журнала: 2025, Номер 39(3)

Опубликована: Март 1, 2025

ABSTRACT Vegetation phenology is a key indicator of climate change and plays vital role in ecosystem water use efficiency (WUE), which balances carbon sequestration loss. As global accelerates, understanding its effects on WUE essential for comprehending dynamics carbon–water cycles. Northwest China (NWC), one the driest regions at similar latitudes, experiencing rapid shift from warm‐dry to warm‐wet climate, posing significant challenges fragile ecosystem. In this study, we used reanalysis satellite remote sensing datasets analyse changes start growing season (SOS), end (EOS) length (LOS) various vegetation types NWC 1982 2015. The focus was how temperature precipitation variations influenced phenological their subsequent impacts Gross Primary Productivity (GPP), evapotranspiration (ET) WUE. Our results show that has experienced warming wetting trend, with SOS advancing by 0.04 days per year EOS delaying year, leading notable extension LOS 0.08 annually. Temperature primarily drives advance, while croplands grasslands shifts forests shrublands dictate delays. increased rate 0.005 gC m −2 mm −1 , influencing GPP ET both directly indirectly through changes. findings underscore cascading Changes have had fluxes, varying across different types. This study provides valuable insights into response mechanisms arid semi‐arid offers critical information sustainable management resources agriculture NWC.

Язык: Английский

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Dynamic Diagnosis of an Extreme Precipitation Event over the Southern Slope of Tianshan Mountains Using Multi-Source Observations

Remote Sensing, Год журнала: 2025, Номер 17(9), С. 1521 - 1521

Опубликована: Апрель 25, 2025

The southern slope of the Tianshan Mountains features complex terrain and an arid climate, yet paradoxically experiences frequent extreme precipitation events (EPEs), which pose significant challenges for weather forecasting. This study investigates EPE that occurred from 20 to 21 August 2019 using multi-source data examine circulation patterns, mesoscale characteristics, moisture dynamics, energy-instability mechanisms. results reveal distinct spatiotemporal variability in precipitation, prompting a two-stage analytical framework: stage 1 (western plains), dominated by localized convective cells, 2 (northeastern mountains), characterized orographically enhanced clusters. event was associated with “two ridges one trough” pattern at 500 hPa dual-core structure South Asian high 200 hPa. Dynamic forcing stemmed cyclonic convergence, vertical wind shear, low-level convergence lines, water vapor (WV) transport, jet-induced upper-level divergence. A stronger vorticity, divergence, velocity resulted more intense precipitation. thermodynamic analysis showed cold advection plains before event. Sounding revealed increases precipitable available potential energy (CAPE) both stages. WV tracing differences sources: 3000 m, ~70% originated Central Asia via Caspian Black Seas; 5000 source path emerged between In 1, specific humidity along each track higher than during EPE, 12 h pre-event enhancement. Both stages featured rapid cloud growth, decreases total black body temperature (TBB) intensification. During center aligned large TBB gradient edge zone, where vigorous convection occurred. contrast typical northern events, are linked colder tops convection, afternoon formed near edges lesser negative values. These findings advance understanding multi-scale mechanisms mountains, aiding improved forecasting terrains.

Язык: Английский

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Warm-wetting and/or warm-drying tendency over Xinjiang, China?

Journal of Hydrology, Год журнала: 2025, Номер unknown, С. 133417 - 133417

Опубликована: Май 1, 2025

Язык: Английский

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Spatial Variability of the Response of Land‐Atmosphere Coupling to Climate Warming in Northern China

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(10)

Опубликована: Май 22, 2025

Abstract Northern China is a global hotspot for intense land‐atmosphere coupling because its atmospheric and land‐surface features vary substantially, making the mutual feedbacks linked responses between variables more prominent. Based on Global Land Data Assimilation System (GLDAS) data, land grid data from ECMWF Re‐Analysis project data‐Interim (ERA‐Interim), Scheme Surface Exchanges over incorporating surface hydrology (ERA5‐land) Evaporation Amsterdam Model 4 (GLEAM4) flux network (FLUXNET) weather observation variability of response processes to climate warming with spatial change background in northern was analyzed. The mechanisms evapotranspiration soil moisture, net radiation moisture precipitation space (defined by annual mean value given physical quantity) were investigated. Additionally, effect characteristics Results indicate that there significant differences trends temperature variation China, strongly reliant energy constraints space. summer monsoon transitional region (SMTR) found be climate‐sensitive zone competition energy, where quantities underwent radical transformation, displayed both positive feedback (temperature increasing→soil decreasing→net decreasing→temperature increasing) negative increasing→temperature decreasing) warming. These findings would improve scientific understanding heterogeneous underlying surface, may provide an important theoretical basis prediction China.

Язык: Английский

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Decoding spatiotemporal dynamic of atmospheric CO2 concentration under different urban development model

Urban Climate, Год журнала: 2025, Номер 61, С. 102474 - 102474

Опубликована: Май 29, 2025

Язык: Английский

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Characteristics of warming and humidification in the Yellow River's upper reaches and their impact on surface water resources

International Journal of Climatology, Год журнала: 2023, Номер 43(16), С. 7667 - 7681

Опубликована: Ноя. 22, 2023

Abstract Based on multi‐source data, including observation, analysis, model calculation, satellite remote sensing, and scenario estimation this study has systematically analysed the warming dry–wet change characteristics of Yellow River's upper reaches in last 60 years. The causes features current humidification their impact surface water resources are also discussed. This found that since 1961, average temperature increased at a rate 0.37°C/10a, which is more significant than increases observed for world, China, even northwest China same period. At beginning century, precipitation reversed direction from decreasing to increasing, with increase (35 mm/10a) 2000. Therefore, climate shown trend River. From dynamic perspective, were drying each climatic period 1961 2010; however, tendency towards dryness slowed by In contrast, region showed consistent 1991 2020. perspective multiple time scales, mainly dominated multi‐decadal scale. interannual change. component explains humidification. Precipitation changes River Basin affected westerly circulation, East Asian summer monsoon, South monsoon circulation systems. However, was different factors scales. On an scale, it circulation. interdecadal wind jointly influenced wind, Under control synergistic enhancement westerly, circulations, vertical field shows abnormal upward movement. There been easterly southerly airflow transports vapour, cold air transported along back Mongolian cyclone, makes humid. humidifying significantly runoff lake area degraded frozen soil. budget responded actual evapotranspiration significantly, but net still trend. did not deficit.

Язык: Английский

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