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

˜The œcryosphere, Journal Year: 2023, Volume and Issue: 17(5), P. 1913 - 1934

Published: May 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.

Language: 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, Journal Year: 2023, Volume and Issue: 16(1), P. 1164 - 1185

Published: April 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.

Language: Английский

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

Journal of Hydrology, Journal Year: 2021, Volume and Issue: 604, P. 127209 - 127209

Published: Nov. 19, 2021

Language: 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, Journal Year: 2022, Volume and Issue: 608, P. 127610 - 127610

Published: Feb. 14, 2022

Language: 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, Journal Year: 2022, Volume and Issue: 368, P. 133148 - 133148

Published: July 18, 2022

Language: 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, Journal Year: 2024, Volume and Issue: 19(5), P. 054027 - 054027

Published: March 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.

Language: Английский

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Siloed funding of multibenefit projects highlights the need for funding programs that integrate cobenefits

Frontiers in Water, Journal Year: 2025, Volume and Issue: 7

Published: April 2, 2025

Multibenefit projects, such as integrated flood risk management are gaining attention solutions for complex social and environmental challenges. Among other benefits, these projects offer opportunities to combine reduction, restoration, climate resilience. However, multibenefit face institutional challenges their implementation. One challenge is securing adequate sustained funding, partly because of a mismatch between the integrative goals narrower intent siloed funding sources structured largely in response needs traditional, single-purpose gray infrastructure projects. We explore how proponents can fund what landscape means project Using Pajaro River California case study, we analyze project’s implications cobenefits. navigating authorization fragmented achieve benefits beyond reduction. thematic document analysis consultations with local partners, outline pursued sources, gaps. In our motivated champions incorporated cobenefits like groundwater recharge habitat restoration into project, despite narrow provisions authorization. challenged efforts, causing some gaps To address challenges, agencies provide programs that reflect nature many encourage cobenefits, rather than rely on incorporate considerations. If decision-makers want across sectors, need consistent promote, stifle, pursuit While institutional, jurisdictional, administrative currently tackled by individuals project-by-project basis, broader effort reform regimes could ease burdens scale up solutions.

Language: Английский

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Snow depth inversion and mapping at 500 m resolution from 1980 to 2020 in Northeast China using radiative transfer model and machine learning

International Journal of Applied Earth Observation and Geoinformation, Journal Year: 2025, Volume and Issue: 139, P. 104533 - 104533

Published: April 14, 2025

Language: Английский

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

Earth s Future, Journal Year: 2022, Volume and Issue: 10(3)

Published: Feb. 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.

Language: Английский

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

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

Published: Nov. 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.

Language: Английский

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