Changes in March mean snow water equivalent since the mid-20th century and the contributing factors in reanalyses and CMIP6 climate models

˜The œcryosphere, Год журнала: 2023, Номер 17(5), С. 1913 - 1934

Опубликована: Май 9, 2023

Abstract. Trends in March mean snow water equivalent (SWE) the Northern Hemisphere are attributed to changes three main factors: total precipitation (P), fraction of as snowfall (F), and accumulated remaining on ground (G). This trend attribution is repeated for two reanalyses (ERA5-Land from 1951 2022 MERRA2 – Modern-Era Retrospective analysis Research Applications, Version 2 1981 2022) simulations by 22 climate models 6th phase Coupled Model Intercomparison Project (CMIP6). The results reveal a decrease SWE most Hemisphere, decreases F G dominate over mostly positive trends P. However, there spatial variability both magnitude sign these trends. There substantial variation between individual CMIP6 models, but agreement multi-model ERA5-Land reasonable area means geographical distribution 2022, with correlation 0.51 trend. worse, probably partly due internal also overestimation recent warming models. Over this shorter period which can be compared MERRA2, marked differences reanalyses. associated reduced (F) more consistent different data sets than resulting P G.

Язык: Английский

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The role of snowmelt discharge to runoff of an alpine watershed: Evidence from water stable isotopes

Journal of Hydrology, Год журнала: 2021, Номер 604, С. 127209 - 127209

Опубликована: Ноя. 19, 2021

Язык: Английский

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Responses of spring soil moisture of different land use types to snow cover in Northeast China under climate change background

Journal of Hydrology, Год журнала: 2022, Номер 608, С. 127610 - 127610

Опубликована: Фев. 14, 2022

Язык: Английский

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Turbidity dynamics of large lakes and reservoirs in northeastern China in response to natural factors and human activities

Journal of Cleaner Production, Год журнала: 2022, Номер 368, С. 133148 - 133148

Опубликована: Июль 18, 2022

Язык: Английский

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A novel fine-resolution snow depth retrieval model to reveal detailed spatiotemporal patterns of snow cover in Northeast China

International Journal of Digital Earth, Год журнала: 2023, Номер 16(1), С. 1164 - 1185

Опубликована: Апрель 10, 2023

Seasonal snow cover is a key component of the global climate and hydrological system, it has drawn considerable attention under warming conditions. Although several passive microwave (PMW) depth (SD) products have been developed since 1970s, they inherit noticeable errors uncertainties when representing spatial distributions temporal changes SD, especially in complex mountainous regions. In this paper, we fine-resolution SD retrieval model (FSDM) using machine learning to improve estimation quality for Northeast China produced long-term, fine-resolution, daily dataset. The accuracies FSDM dataset were evaluated against in-situ data along with existing products. results showed provided satisfactory inversion accuracy spatiotemporal evaluation, root-mean-square error (RMSE), bias, correlation coefficient (R) 7.10 cm, −0.13 0.60. Additionally, analyzed variations found that was mainly distributed Greater Khingan Range, Lesser Mountains, Changbai Mountain exhibited high-low distribution patterns increased latitude. annual mean slightly at rate 0.029 cm/year during 1987-2018.

Язык: Английский

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Was Warming Amplified Under Drought Conditions Across China in Observations and Future Projections?

Earth s Future, Год журнала: 2022, Номер 10(3)

Опубликована: Фев. 7, 2022

Abstract Concurrent hot extremes and droughts undoubtedly aggravate the impacts of on agriculture, natural environment, human society. Recent studies mainly focus trends changes in frequency severity compound drought extreme events. However, relatively little attention has been paid to mean temperature during conditions. In this study, we investigated observed projected periods across China a century time‐scale explored possible contributions land surface‐atmosphere interactions or atmospheric moisture conditions these changes. experienced reduced rather than amplified warming under both observations future projections. A drier condition higher emission scenario was result larger range future. We attributed temperatures increasing winter This study provides reference for water resource management, risk reduction, as well mitigation agricultural crop loss public health damage.

Язык: Английский

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Warming-induced vapor pressure deficit suppression of vegetation growth diminished in northern peatlands

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Ноя. 30, 2023

Recent studies have reported worldwide vegetation suppression in response to increasing atmospheric vapor pressure deficit (VPD). Here, we integrate multisource datasets show that VPD caused by warming alone does not suppress growth northern peatlands. A site-level manipulation experiment and a multiple-site synthesis find neutral impact of rising on growth; regional analysis manifests strong declining gradient impacts from sparsely distributed peatland densely peatland. The major mechanism adopted plants is the "open" water-use strategy, where stomatal regulation relaxed maximize carbon uptake. These unique surface characteristics evolve wet soil‒air environment observed peatlands contrast with global nonpeatland areas under concurrent decreasing relative humidity, suggesting model improvement for representing remains necessary.

Язык: Английский

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Significant decreasing trends in snow cover and duration in Northeast China during the past 40 years from 1980 to 2020

Journal of Hydrology, Год журнала: 2023, Номер 626, С. 130318 - 130318

Опубликована: Окт. 17, 2023

Язык: Английский

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Evaluating the impact of peat soils and snow schemes on simulated active layer thickness at pan-Arctic permafrost sites

Environmental Research Letters, Год журнала: 2024, Номер 19(5), С. 054027 - 054027

Опубликована: Март 28, 2024

Abstract Permafrost stability is significantly influenced by the thermal buffering effects of snow and active-layer peat soils. In warm season, soils act as a barrier to downward heat transfer mainly due their low conductivity. cold snowpack serves insulator, retarding release from soil atmosphere. Currently, many global land models overestimate permafrost temperature active layer thickness (ALT), partially inaccurate representations organic matter (SOM) density profiles insulation. this study, we evaluated impacts SOM schemes on ALT simulations at pan-Arctic sites using Energy Exascale Earth System Model (E3SM) model (ELM). We conducted Circumpolar Active Layer Monitoring (CALM) across domain. improved ELM-simulated site-level knowledge-based hierarchical optimization procedure examined precipitation-phase partitioning methods (PPMs), compaction schemes, conductivity simulated depth, temperature, ALT, CO 2 fluxes. Results showed that optimized ELM agreement with observed (e.g. RMSE decreased 0.83 m 0.15 m). Our sensitivity analysis revealed snow-related impact insulation levels, ALT. For example, one commonly used (quadratic Sturm or SturmQua) generally produced warmer temperatures larger compared other two tested schemes. The SturmQua scheme also amplified model’s PPMs predicted deeper ALTs than under both current future climates. study highlights importance accurately representing processes in enhance dynamics simulations.

Язык: Английский

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Spring and summer potential flood risk in Northeast China

Journal of Hydrology Regional Studies, Год журнала: 2021, Номер 38, С. 100951 - 100951

Опубликована: Окт. 27, 2021

Northeast China is an important region for industry and agriculture in China. In this region, investigations are lacking on the spatial distribution of snow melt contributions to spring maximum runoff/discharge, no studies have compared summer potential flood risks. Here, first time China, we investigated runoff/discharge risks terms their distributions, crop production economic exposures. We find that contributes approximately three-fourths floods from 1982 2011. On average, exposures represent 3.9% 0.4% total GDP, respectively. Potentially exposed maize, rice soybean accounts 2.8% total, potentially wheat 0.3% total. GDP growth amplifies increasing trends exposure, while changes exposure dominated by variations. This study unique quantified

Язык: Английский

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