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Generation of chilling hours maps using surface observations and satellite data 期刊论文
ATMOSPHERIC RESEARCH, 2020, 236
作者:  Jimenez, Maria A.;  Grau, Antoni;  Cuxart, Joan
收藏  |  浏览/下载：17/0  |  提交时间：2020/07/02
Nocturnal cooling  Chilling hours  Weak-wind nights  2 m-temperature  Land surface temperature  Clear-sky  Surface heterogeneities  
The past and future of global river ice 期刊论文
NATURE, 2020, 577 (7788) : 69-+
作者:  Yang, Xiao;  Pavelsky, Tamlin M.;  Allen, George H.
收藏  |  浏览/下载：41/0  |  提交时间：2020/05/13

More than one-third of Earth'  s landmass is drained by rivers that seasonally freeze over. Ice transforms the hydrologic(1,2), ecologic(3,4), climatic(5) and socio-economic(6-8) functions of river corridors. Although river ice extent has been shown to be declining in many regions of the world(1), the seasonality, historical change and predicted future changes in river ice extent and duration have not yet been quantified globally. Previous studies of river ice, which suggested that declines in extent and duration could be attributed to warming temperatures(9,10), were based on data from sparse locations. Furthermore, existing projections of future ice extent are based solely on the location of the 0-degrees C isotherm11. Here, using satellite observations, we show that the global extent of river ice is declining, and we project a mean decrease in seasonal ice duration of 6.10 +/- 0.08 days per 1-degrees C increase in global mean surface air temperature. We tracked the extent of river ice using over 400,000 clear-sky Landsat images spanning 1984-2018 and observed a mean decline of 2.5 percentage points globally in the past three decades. To project future changes in river ice extent, we developed an observationally calibrated and validated model, based on temperature and season, which reduced the mean bias by 87 per cent compared with the 0-degree-Celsius isotherm approach. We applied this model to future climate projections for 2080-2100: compared with 2009-2029, the average river ice duration declines by 16.7 days under Representative Concentration Pathway (RCP) 8.5, whereas under RCP 4.5 it declines on average by 7.3 days. Our results show that, globally, river ice is measurably declining and will continue to decline linearly with projected increases in surface air temperature towards the end of this century.


  
Quantifying the Clear-Sky Bias of Satellite Land Surface Temperature Using Microwave-Based Estimates 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2019, 124 (2) : 844-857
作者:  Ermida, Sofia L.;  Trigo, Isabel F.;  DaCamara, Carlos C.;  Jimenez, Carlos;  Prigent, Catherine
收藏  |  浏览/下载：9/0  |  提交时间：2019/04/09
land surface temperature  clear-sky bias  microwave LST  all-weather LST  
Sunshine duration and global radiation trends in Italy (1959-2013): To what extent do they agree? 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2017, 122 (8)
作者:  Manara, V.;  Brunetti, M.;  Maugeri, M.;  Sanchez-Lorenzo, A.;  Wild, M.
收藏  |  浏览/下载：7/0  |  提交时间：2019/04/09
global radiation  sunshine duration  comparison  all-sky  clear-sky conditions  sensitivity to atmospheric turbidity  
Aerosol radiative effects under clear skies over Europe and their changes in the period of 2001-2012 期刊论文
INTERNATIONAL JOURNAL OF CLIMATOLOGY, 2017, 37 (4)
作者:  Bartok, Blanka
收藏  |  浏览/下载：11/0  |  提交时间：2019/04/09
aerosols radiative effects  water vapour  clear-sky surface solar radiation  linear trend