Discussion of the “warming and wetting” trend and its future variation in the drylands of Northwest China under global warming

Science China Earth Sciences, Год журнала: 2023, Номер 66(6), С. 1241 - 1257

Опубликована: Май 16, 2023

Язык: Английский

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Spatio-temporal dynamic evaluation of agricultural drought based on a three-dimensional identification method in Northwest China

Agricultural Water Management, Год журнала: 2023, Номер 284, С. 108325 - 108325

Опубликована: Май 2, 2023

Drought evolution is a complex dynamic process, showing continuous characteristics in space-time. Currently, the researches on drought dynamics from multiple dimensions are limited and should be improved further. Therefore, three-dimensional identification method was adopted to investigate spatiotemporal patterns of classified events (namely two-month events, within-year cross-year events) northwest China during1961–2018. Furthermore, more spatial variables event, such as start end location, orientation rotation, were extracted describe migration trajectories events. Significantly, rotation helped reveal forcing mechanisms (such influence climate land surface) behind their development. The results showed that total 169 identified over 1961–2018, (duration, area, severity, distance) represented fluctuating decreasing trend with rate − 0.135/10a, 0.006/10a, 0.16/10a, 5.67/10a. process individual event objectively effectively depicted perspective, which consistent historical records study area. Regarding magnitude severe 1961–1980 than 1981–2018, three primary (east-to-east, west-to-west, south-to-south) China. Within-year mostly started first quarters finished second half year, whilst situation reversed for Spatially, Alxa League Inner Mongolia Qinghai Province two main centers. Additionally, characterized by clockwise distributed plateau southeast zones, anticlockwise westerly zone. Noticeably, east-to-east pathways mainly located east part while west-to-west south-to-south dominated west part.

Язык: Английский

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Warming-and-wetting trend over the China’s drylands: Observational evidence and future projection

Global Environmental Change, Год журнала: 2024, Номер 86, С. 102826 - 102826

Опубликована: Март 11, 2024

A recent "warming-and-wetting" trend over China's drylands has raised widespread attention in the scientific community. Based on observations and model projections of temperature precipitation, this study shows that warming regional wetting is becoming stronger. Over past 60 years, increased at a rate 0.34 °C/10a, much higher than China (0.29 °C/10a) globally (0.22 °C/10a). The been primarily apparent western part since 1980s, particularly mountainous areas. In northeast edge Qinghai-Tibet Plateau, exceeded 30 mm/10a. possible cause increase precipitation may be convective also concentrating Model show weak strong future under RCP2.6 RCP8.5 scenarios, respectively. Precipitation will slightly mid-21st century then decrease slowly until end 21st scenario. comparison, scenario, it by 15–25% century.

Язык: Английский

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Interdecadal Variation of Springtime Compound Temperature‐Precipitation Extreme Events in China and Its Association With Atlantic Multidecadal Oscillation and Interdecadal Pacific Oscillation

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(2)

Опубликована: Янв. 13, 2025

Abstract The concurrent occurrence of temperature and precipitation extremes, known as compound temperature‐precipitation extreme events (CTPEEs), leads to more pronounced consequences for human society ecosystems than when these extremes occur separately. However, such have not been sufficiently studied, especially during boreal spring. Spring is an important transition season, which the CTPEEs plays a pivotal role in plant growth revival terrestrial ecosystems. This study investigates spatio‐temporal variation characteristics spring China, including warm‐dry, warm‐wet, cold‐dry, cold‐wet combinations. most frequently, followed by cold‐dry events. frequency associated with warm (cold) shows marked interdecadal increase (decrease) around mid‐to‐late 1990s. It found that change primarily determined extremes. shift coincides phase transitions Atlantic Multidecadal Oscillation (AMO) Interdecadal Pacific (IPO). After 1990s, configuration positive AMO negative IPO excited atmospheric wave trains over mid‐high latitudes, causing high‐pressure anticyclonic anomalies East Asia. less cloudiness, allowing downward solar radiation, enhances surface warming contributes warm‐dry warm‐wet above observations are confirmed Pacemaker experiments. results this highlight significant contribution internal climate variability changes at regional scale.

Язык: Английский

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Applicability of Different Indices for Delineating the Boundary of Arid Region: A Case Study in Northwestern China

Journal of Earth Science, Год журнала: 2025, Номер 36(1), С. 212 - 222

Опубликована: Фев. 1, 2025

Язык: Английский

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Progress and prospect on climate warming and humidification in Northwest China

Chinese Science Bulletin (Chinese Version), Год журнала: 2022, Номер 68(14), С. 1814 - 1828

Опубликована: Окт. 17, 2022

西北地区是全球特殊的自然地理环境区，气候变化比较独特、形成机理比较复杂、对社会和自然环境的影响比较突出。尤其，自本世纪初有研究提出气候从暖干向暖湿转型的科学认识之后，西北地区气候变化问题引起了学术界乃至社会各界的普遍关注，也兴起了对西北地区气候变化趋势、驱动机制及影响特征的广泛研究，三十多年来已积累了大量的研究成果。然而，由于以往不同研究所用资料的类型、序列长度和时空分辨率不同，所关注的时段和区域不同，认识问题的视角和维度不同，使得对西北地区气候变化存在一些分歧认识或者相悖结论，导致社会和媒体上出现一些五花八门的论调，甚至认为西北地区可能会变成“江南”或重回“汉唐”等等。鉴于此，本研究通过系统梳理西北地区气候变化研究的历史经纬，总结归纳已有的研究成果，综合考虑不同视角和不同维度，划分了西北地区增暖与干湿变化特征科学认识的六个阶段；从人类活动和大气环流两方面对西北暖湿化的驱动机制进行了概括；同时从暖湿化对生态、农业及水资源等方面的影响进行了评估；对未来的暖湿变化趋势及其可能的风险进行了预估；最后针对当前西北暖湿化研究中存在的不足和问题，提出未来研究需要从大气、水文及生态等多学科相互作用角度探讨气候暖湿化的驱动机制、暖湿化背景下极端天气气候事件的变化特征、地表水分循环对暖湿化的响应特征、暖湿化与水文和生态的耦合机制、暖湿化对水安全、生态安全及粮食安全带来的机遇和风险以及“双碳”目标下西北地区未来气候变化趋势与适应等重点科学问题上取得突破。

Язык: Английский

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Warmer and wetter climate induced by the continual increase in atmospheric temperature and precipitable water vapor over the arid and semi–arid regions of Northwest China

Journal of Hydrology Regional Studies, Год журнала: 2022, Номер 42, С. 101151 - 101151

Опубликована: Июнь 27, 2022

arid and semi–arid regions of Northwest China Precipitable water vapor (PW) is the medium for energy exchange, supplies moisture precipitation. Based on meteorological data PW from observation six reanalysis products, climate shift in (ASRNC) during 1980–2018 have been explored by applying reference scaling conversion efficiency The sets was overestimated spring, while underestimated summer, autumn, winter. However, spatial distribution simulated more consistent with topography ASRNC. From 1980–2018, context overall regional warming, likely to present significant increasing trends over high scaling. In general, increased 1980 2000, fluctuating upward trend intensified thereafter. Meanwhile, rates were remarkably 2000–2018. precipitation ASRNC greatly influenced efficiency, especially spring autumn. Generally, wet tendency identified western central because increase 2018.

Язык: Английский

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Intensified Structural Overshoot Aggravates Drought Impacts on Dryland Ecosystems

Earth s Future, Год журнала: 2024, Номер 12(1)

Опубликована: Янв. 1, 2024

Abstract A favorable environment can induce vegetation overgrowth to exceed the ecosystem carrying capacity, exacerbating water resource depletion and increasing risk of lagged effects on degradation. This phenomenon is defined as structural overshoot, which lead large‐scale forest mortality grassland deterioration. However, current understanding overshoot remains incomplete due complex time‐varying interactions between climate. Here, we used a dynamic learning algorithm decompose contributions climate drought occurrence, trace connection antecedent concurrent dynamics, thus effectively capturing overshoot. study focused climate‐sensitive hotspot in Northwest China drylands, where significant greening induced by warming wetting was detected during 1982–2015, leading soil moisture deficit aggravating degradation risks droughts. We found that this period, approximately 34.6% events, accounted for 16.7% these events. The occurrence droughts exhibited an trend over time, primarily driven followed precipitation variation. Although severity non‐overshoot were generally comparable spatial distribution, impact still becoming increasingly obvious. Our results indicate expected intensified cannot be ignored emphasize necessity sustainable agroecosystem management strategies.

Язык: Английский

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An Analysis of the Instability Conditions and Water Vapor Transport Characteristics during a Typical Rainstorm in the Tarim Basin

Atmosphere, Год журнала: 2024, Номер 15(2), С. 210 - 210

Опубликована: Фев. 8, 2024

In order to deepen the understanding of occurrence mechanism and water vapor transport characteristics heavy rain process in extreme arid region Xinjiang, a rare Tarim Basin during period 18–22 July 2021 was comprehensively analyzed by using multi-source data. The results show that upper tropospheric South Asian high distributed “west-high-east-low” pattern rainstorm process, area located on right side jet stream entrance area, while middle-level Iranian pressure, Baikal pressure Central low formed “two-highs one-low” circulation situation. coupling air jets strong vertical upward motion provided favorable dynamic conditions. Rainstorm mainly comes from Mediterranean Sea, Asia Indian Ocean, it enters basin four paths: west, east west east, southwest south. flows into middle layer western boundary southern lower eastern boundary, out boundary. negative moist potential vorticity at level has indicator significance for development rain, superposition positive regions height is conducive rain.

Язык: Английский

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Cyclical ‘wetting’ phenomenon in the source region of Yellow River under long-term trends from 1956 to 2022

Journal of Hydrology Regional Studies, Год журнала: 2024, Номер 53, С. 101821 - 101821

Опубликована: Май 21, 2024

the source region of Yellow River (SRYB) Due to environmental changes, drying and wetting processes have become increasingly intricate, it is uncertain whether phenomenon in SRYB indicates a long-term trend or temporary cyclic event. This study utilized monthly streamflow precipitation records from 1956 2022 calculate hydrological meteorological-dryness/wetness, represented by standardized indices, respectively. used detrended, wavelet, cross-wavelet methods investigate dry-wet variability identified atmospheric circulation phenomena driving dryness/wetness cyclical changes region. (i) The showed an overall fluctuating trend, which intensified after 2000. (ii) There were notable oscillatory cycles at 3–5 years, 10–12 approximately 20–25 years both meteorological variability. (iii) Transitions dry wet conditions had no significant link short-term (e.g., years), but linked decadal years). (iv) Spring winter dominated interannual (v) ENSO, AMO, PDO influenced fluctuations, while AO fluctuations. that follows pattern, intensification since 2000 consistent with signal.

Язык: Английский

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