Quantifying moisture and sensible heat flux anomalies for compound drought and heat wave events in the Iberian Peninsula

Weather and Climate Extremes, Journal Year: 2025, Volume and Issue: unknown, P. 100756 - 100756

Published: Feb. 1, 2025

Language: Английский

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Meteorological ingredients of heavy precipitation and subsequent lake-filling episodes in the northwestern Sahara

Hydrology and earth system sciences, Journal Year: 2025, Volume and Issue: 29(5), P. 1395 - 1427

Published: March 17, 2025

Abstract. The dry Sahara was potentially wetter in the past during warm African Humid Period. Although debated, this climatic shift is a possible scenario future warmer climate. One major line of evidence reported for green periods presence paleo-lakes. Even today, Saharan desert lakes get filled from time to time. However, very little known about these events due lack available situ observations. In addition, hydrometeorological conditions associated with have never been systematically investigated. This study proposes filling knowledge gap by examining meteorology lake-filling episodes (LFEs) Sebkha el Melah – commonly lake northwestern Sahara. Heavy-precipitation (HPEs) and LFEs are identified using combination precipitation observations volume estimates derived satellite remote sensing. Weather reanalysis data used together three-dimensional trajectory calculations investigate moisture sources characteristics weather systems that lead HPEs assess necessary producing LFEs. Results show hundreds occurred between 2000 2021, but only six eventuated. ratio increase water triggered filling, as runoff coefficient, provides useful characteristic storm impacts on availability. For investigated study, coefficient ranges across 5 orders magnitude, much lower than ratios often cited literature We find generated most frequently autumn intense HPEs, which key ingredients (i) formation surface extratropical cyclones west North Atlantic coast interplay upper-level troughs lows, (ii) convergence tropics Atlantic, (iii) pre-moistening region upstream catchment over through recycling-domino-process, (iv) coupled or sequential lifting processes (e.g. orographic large-scale forcing), (v) stationarity synoptic result long-duration (typically 3 d) HPEs. Based insights gained into present-day climate, we suggest initial persistence may be related changes intensity, frequency, pattern rather change mean alone. Future studies can leverage better mechanisms involved greening and, potentially, future.

Language: Английский

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Paleoclimatic and paleoenvironmental changes in Amazonian lowlands over the last three millennia

Quaternary Science Reviews, Journal Year: 2022, Volume and Issue: 279, P. 107383 - 107383

Published: Jan. 29, 2022

Language: Английский

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A unified framework to estimate the origins of atmospheric moisture and heat using Lagrangian models

Geoscientific model development, Journal Year: 2022, Volume and Issue: 15(5), P. 1875 - 1898

Published: March 7, 2022

Abstract. Despite the existing myriad of tools and models to assess atmospheric source–receptor relationships, their uncertainties remain largely unexplored arguably stem from scarcity observations available for validation. Yet, Lagrangian are increasingly used determine origin precipitation heat by scrutinizing changes in moisture temperature along air parcel trajectories. Here, we present a unified framework process-based evaluation trajectories infer relationships both heat. The comprises three steps: (i) diagnosing precipitation, surface evaporation, sensible simulations identifying accuracy reliability flux detection criteria; (ii) establishing through attribution sources multi-day backward trajectories; (iii) performing bias correction relationships. Applying this model FLEXPART, driven with ERA-Interim reanalysis data, allows us quantify errors associated resulting cities different climates (Beijing, Denver, Windhoek). Our results reveal large inherent estimation models, but they also demonstrate that source sink acts reduce uncertainty. proposed paves way cohesive assessment dependencies

Language: Английский

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Environmental drivers of precipitation stable isotopes and moisture sources in the Mongolian Plateau

Journal of Hydrology, Journal Year: 2023, Volume and Issue: 621, P. 129615 - 129615

Published: May 4, 2023

Language: Английский

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Quantifying Temperature and Precipitation Change Caused by Land Cover Change: A Case Study of India Using the WRF Model

Frontiers in Environmental Science, Journal Year: 2021, Volume and Issue: 9

Published: Dec. 10, 2021

The large-scale Land-Uses and Land-Cover Changes (LULCC) in India the past several decades is primarily driven by anthropogenic factors that influence climate from regional to global scales. Therefore, understand LULCC over Indian region 2002 2015 its implications on temperature precipitation, we performed Weather Research Forecast (WRF) model simulation using European Centre for Medium-Range (ECMWF) reanalysis data period 2009 as a boundary condition with spin-up time. results showed moderate forest cover loss major parts of northeast India, Himalayan during 2002–2015. Such large LULC changes, significant alteration grassland agriculture forest, led increased precipitation due increasing evapotranspiration (ET) similar forest-dominated regions. An increase patterns (>300 mm) was observed eastern western Himalayas, Ghats, northwestern part central while most Himalayas have an exceptional (∼100–150 mm), which shows agreement leaf area index (LAI) ∼15%. overall phenomenon leads greening-induced ET enhancement increases atmospheric water vapor content promotes downwind precipitation. In case temperature, warming cooling parts. vegetated areas northwest ET, ultimately resulted decreased study highlights changes recent because necessitates formulation sustainable land use-based strategies control meteorological variability augment ecological sustainability.

Language: Английский

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How does Mei-yu precipitation respond to climate change?

National Science Review, Journal Year: 2023, Volume and Issue: 10(12)

Published: Sept. 18, 2023

ABSTRACT Mei-yu is an important weather phenomenon in the middle-lower Yangtze River valley (YRV) region. This study investigates changes characteristics of under global warming and potential reasons based on observation reanalysis data during 1961–2022. Notable increasing long-term trends are detected number days without rainfall (NDWOR), intensity events, frequency extreme precipitation events (EPEs) YRV region period (15 June–10 July) over past decades. The trend NDWOR attributed to decreased relative humidity land surface a longer time for air be replenished with moisture after climate. frequency/intensity EPEs strengthened transient water vapor convergence convection atmosphere warming. Furthermore, response 2°C respect pre-industrial climate analysed using CMIP6 models. results suggest that NDWOR, will increase scenario, which implies more challenging risk management future. Overall, has most significant change observations projections. model have relatively large uncertainty.

Language: Английский

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The Contribution of Local and Remote Transpiration, Ground Evaporation, and Canopy Evaporation to Precipitation Across North America

Journal of Geophysical Research Atmospheres, Journal Year: 2023, Volume and Issue: 128(7)

Published: March 17, 2023

Abstract Land surface evapotranspiration (ET) is a major source of moisture for the global hydrologic cycle. Though influence land well documented, tracking analyses aimed at quantifying contribution to precipitation have often relied on offline approaches that require simplifying assumptions and can bias results. Additionally, ET components (transpiration ( T ), canopy evaporation C ground E )) individually not understood, inhibiting our understanding teleconnections in both current future climate. Here, we use Community Earth System Model version 1.2 with online numerical water tracers examine local remote ET, including from each individual component, across North America. Much northern northeastern America receives up 80% summertime over 50% originates transpiration alone. Local recycling constitutes an essential much southern western regions America, suggesting region sensitive conditions, soil vegetation state. The reliance locally recycled far less pronounced eastern where remotely sourced moisture, particularly transpiration, dominates contributions. results highlight are especially cover changes upwind areas, providing key insights drought prediction resource management.

Language: Английский

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Projected changes in atmospheric moisture transport contributions associated with climate warming in the North Atlantic

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 14, 2023

Global warming and associated changes in atmospheric circulation patterns are expected to alter the hydrological cycle, including intensity position of moisture sources. This study presents predicted for middle end 21st century under SSP5-8.5 scenario two important extratropical sources: North Atlantic Ocean (NATL) Mediterranean Sea (MED). Changes over Iberian Peninsula-considered as a strategic sink its location-are also studied detail. By century, from NATL will increase precipitation eastern America winter autumn on British Isles winter. Moisture MED southern western portions continental area. Precipitation with source decrease mainly Europe, while that Europe Africa. recycling Peninsula all seasons except summer mid-century. Climate change, simulated by CESM2 thus modifies transport, affecting regional cycles.

Language: Английский

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Heat and Moisture Anomalies During Crop Failure Events in the Southeastern Australian Wheat Belt

Earth s Future, Journal Year: 2024, Volume and Issue: 12(3)

Published: March 1, 2024

Abstract Prolonged droughts and heatwaves are common causes of agricultural failure in Australia, yet the origins these climate anomalies remain understudied. Here, we use a Lagrangian trajectory model driven by atmospheric reanalysis constrained satellite data to unravel sources precipitation heat over Southeastern Australia wheat belt. Furthermore, assess impact local upwind drought conditions on moisture imports region. Results indicate that most extreme crop events belt (i.e., 1994, 2002, 2006) were associated with persistent high‐pressure systems. The ocean provided average 72% for 39% arriving belt, substantially decreasing during events. Upwind further intensified rainfall deficits stress due lower higher This was particularly clear initial phase Millennium Drought 2002. Then, yield exceeded 50%, ∼4% originated from drought‐affected regions upwind, compared 9% expected climatologically those regions. Simultaneously, import increased ∼10 W m −2 , climatological 23%–25%, this event. While results limited potential land management mitigate downwind loss other climatic dependency remote may benefit such strategies.

Language: Английский

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