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Patterns and trends of Northern Hemisphere snow mass from 1980 to 2018 期刊论文
NATURE, 2020, 581 (7808) : 294-+
作者:  Ibrahim, Nizar;  Maganuco, Simone;  Dal Sasso, Cristiano;  Fabbri, Matteo;  Auditore, Marco;  Bindellini, Gabriele;  Martill, David M.;  Zouhri, Samir;  Mattarelli, Diego A.;  Unwin, David M.;  Wiemann, Jasmina;  Bonadonna, Davide;  Amane, Ayoub;  Jakubczak, Juliana;  Joger, Ulrich;  Lauder, George V.;  Pierce, Stephanie E.
收藏  |  浏览/下载:37/0  |  提交时间:2020/05/25

Warming surface temperatures have driven a substantial reduction in the extent and duration of Northern Hemisphere snow cover(1-3). These changes in snow cover affect Earth'  s climate system via the surface energy budget, and influence freshwater resources across a large proportion of the Northern Hemisphere(4-6). In contrast to snow extent, reliable quantitative knowledge on seasonal snow mass and its trend is lacking(7-9). Here we use the new GlobSnow 3.0 dataset to show that the 1980-2018 annual maximum snow mass in the Northern Hemisphere was, on average, 3,062 +/- 35 billion tonnes (gigatonnes). Our quantification is for March (the month that most closely corresponds to peak snow mass), covers non-alpine regions above 40 degrees N and, crucially, includes a bias correction based on in-field snow observations. We compare our GlobSnow 3.0 estimates with three independent estimates of snow mass, each with and without the bias correction. Across the four datasets, the bias correction decreased the range from 2,433-3,380 gigatonnes (mean 2,867) to 2,846-3,062 gigatonnes (mean 2,938)-a reduction in uncertainty from 33% to 7.4%. On the basis of our bias-corrected GlobSnow 3.0 estimates, we find different continental trends over the 39-year satellite record. For example, snow mass decreased by 46 gigatonnes per decade across North America but had a negligible trend across Eurasia  both continents exhibit high regional variability. Our results enable a better estimation of the role of seasonal snow mass in Earth'  s energy, water and carbon budgets.


Applying a bias correction to a state-of-the-art dataset covering non-alpine regions of the Northern Hemisphere and to three other datasets yields a more constrained quantification of snow mass in March from 1980 to 2018.


  
Millennial-scale hydroclimate control of tropical soil carbon storage 期刊论文
NATURE, 2020, 581 (7806) : 63-+
作者:  Lam, Tommy Tsan-Yuk;  Jia, Na;  Zhang, Ya-Wei;  Shum, Marcus Ho-Hin;  Jiang, Jia-Fu;  Zhu, Hua-Chen;  Tong, Yi-Gang;  Shi, Yong-Xia;  Ni, Xue-Bing;  Liao, Yun-Shi;  Li, Wen-Juan;  Jiang, Bao-Gui;  Wei, Wei;  Yuan, Ting-Ting;  Zheng, Kui;  Cui, Xiao-Ming;  Li, Jie;  Pei, Guang-Qian
收藏  |  浏览/下载:65/0  |  提交时间:2020/05/13

Over the past 18,000 years, the residence time and amount of soil carbon stored in the Ganges-Brahmaputra basin have been controlled by the intensity of Indian Summer Monsoon rainfall, with greater carbon destabilization during wetter, warmer conditions.


The storage of organic carbon in the terrestrial biosphere directly affects atmospheric concentrations of carbon dioxide over a wide range of timescales. Within the terrestrial biosphere, the magnitude of carbon storage can vary in response to environmental perturbations such as changing temperature or hydroclimate(1), potentially generating feedback on the atmospheric inventory of carbon dioxide. Although temperature controls the storage of soil organic carbon at mid and high latitudes(2,3), hydroclimate may be the dominant driver of soil carbon persistence in the tropics(4,5)  however, the sensitivity of tropical soil carbon turnover to large-scale hydroclimate variability remains poorly understood. Here we show that changes in Indian Summer Monsoon rainfall have controlled the residence time of soil carbon in the Ganges-Brahmaputra basin over the past 18,000 years. Comparison of radiocarbon ages of bulk organic carbon and terrestrial higher-plant biomarkers with co-located palaeohydrological records(6) reveals a negative relationship between monsoon rainfall and soil organic carbon stocks on a millennial timescale. Across the deglaciation period, a depletion of basin-wide soil carbon stocks was triggered by increasing rainfall and associated enhanced soil respiration rates. Our results suggest that future hydroclimate changes in tropical regions are likely to accelerate soil carbon destabilization, further increasing atmospheric carbon dioxide concentrations.


  
Changes in forest structure since 1860 in ponderosa pine dominated forests in the Colorado and Wyoming Front Range, USA 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2018, 422: 147-160
作者:  Battaglia, Mike A.;  Gannon, Benjamin;  Brown, Peter M.;  Fornwalt, Paula J.;  Cheng, Antony S.;  Huckaby, Laurie S.
收藏  |  浏览/下载:17/0  |  提交时间:2019/04/09
Ecological restoration  Dendrochronology  Collaborative Forest Landscape Restoration Program (CFLRP)  Historical range of variability  Ponderosa pine  
Characterizing historical fire patterns as a guide for harvesting planning using landscape metrics derived from long term satellite imagery 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2017, 399
作者:  San-Miguel, Ignacio;  Andison, David W.;  Coops, Nicholas C.
收藏  |  浏览/下载:28/0  |  提交时间:2019/04/09
Harvesting  Fire emulation  Historical range of variability  Patch metrics  Fire patterns  Landsat sensor  
Efficacy of resource objective wildfires for restoration of ponderosa pine (Pinus ponderosa) forests in northern Arizona 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2017, 389
作者:  Huffman, David W.;  Meador, Andrew J. Sanchez;  Stoddard, Michael T.;  Crouse, Joseph E.;  Roccaforte, John P.
收藏  |  浏览/下载:12/0  |  提交时间:2019/04/09
Restoration objectives  Historical range of variability  Forest structure  Hazardous fuels  Forest fire management  
Spatiotemporal rainfall and temperature trends throughout the Brazilian Legal Amazon, 1973-2013 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2017, 37 (4)
作者:  Almeida, C. T.;  Oliveira-Junior, J. F.;  Delgado, R. C.;  Cubo, P.;  Ramos, M. C.
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Amazon forest  climate change  climatic variability mode  range of rainfall  
A walk on the wild side: Disturbance dynamics and the conservation and management of European mountain forest ecosystems 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2017, 388
作者:  Kulakowski, Dominik;  Seidl, Rupert;  Holeksa, Jan;  Kuuluvainen, Timo;  Nagel, Thomas A.;  Panayotov, Momchil;  Svoboda, Miroslav;  Thorn, Simon;  Vacchiano, Giorgio;  Whitlock, Cathy;  Wohlgemuth, Thomas;  Bebi, Peter
收藏  |  浏览/下载:20/0  |  提交时间:2019/04/09
Disturbance regimes  Socioecological systems  Temperate forests  Range of variability  Resilience  Wilderness  
Spatial and temporal dimensions of fire activity in the fire-prone eastern Canadian taiga 期刊论文
GLOBAL CHANGE BIOLOGY, 2017, 23 (3)
作者:  Erni, Sandy;  Arseneault, Dominique;  Parisien, Marc-Andre;  Begin, Yves
收藏  |  浏览/下载:17/0  |  提交时间:2019/04/09
extreme weather  fire overlaps  fire size  fire-free intervals  fuel feedback  natural range of variability  predictability of boreal forest-age mosaics  top-down vs. bottom-up drivers of fire activity