23 research outputs found
The atmospheric role in the Arctic water cycle: A review on processes, past and future changes, and their impacts
This is the final version of the article. Available from the publisher via the DOI in this record.Atmospheric humidity, clouds, precipitation, and evapotranspiration are essential components of the Arctic climate system. During recent decades, specific humidity and precipitation have generally increased in the Arctic, but changes in evapotranspiration are poorly known. Trends in clouds vary depending on the region and season. Climate model experiments suggest that increases in precipitation are related to global warming. In turn, feedbacks associated with the increase in atmospheric moisture and decrease in sea ice and snow cover have contributed to the Arctic amplification of global warming. Climate models have captured the overall wetting trend but have limited success in reproducing regional details. For the rest of the 21st century, climate models project strong warming and increasing precipitation, but different models yield different results for changes in cloud cover. The model differences are largest in months of minimum sea ice cover. Evapotranspiration is projected to increase in winter but in summer to decrease over the oceans and increase over land. Increasing net precipitation increases river discharge to the Arctic Ocean. Over sea ice in summer, projected increase in rain and decrease in snowfall decrease the surface albedo and, hence, further amplify snow/ice surface melt. With reducing sea ice, wind forcing on the Arctic Ocean increases with impacts on ocean currents and freshwater transport out of the Arctic. Improvements in observations, process understanding, and modeling capabilities are needed to better quantify the atmospheric role in the Arctic water cycle and its changes.We thank all colleagues involved in the
Arctic Freshwater Synthesis (AFS) for
fruitful discussions. In particular, John
Walsh is acknowledged for his constructive
comments on the manuscript. AFS
has been sponsored by the World
Climate Research Programme’s Climate
and the Cryosphere project (WCRP-CliC),
the International Arctic Science
Committee (IASC), and the Arctic
Monitoring and Assessment Programme
(AMAP). The work for this paper has been
supported by the Academy of Finland
(contracts 259537 and 283101), the UK
Natural Environment Research Council
(grant NE/J019585/1), the US National
Science Foundation grant ARC-1023592
and the Program “Arctic” and the Basic
Research Program of the Presidium
Russian Academy of Sciences. NCAR is
supported by the U.S. National Science
Foundation. We gratefully acknowledge
the project coordination and meeting
support of Jenny Baeseman and
Gwenaelle Hamon at the CliC
International Project Office. No new data
were applied in the manuscript. Data
applied for Figures 2 and 3 are available
from the JRA-55 archive at http://jra.
kishou.go.jp/JRA-55/index_en.
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P1080: COMPARISON OF NIVOLUMAB 40 MG EFFICACY VERSUS 3 MG/KG IN PATIENTS WITH RELAPSED AND REFRACTORY CLASSIC HODGKIN LYMPHOMA
First data on landscape evolution in the southern Kurile Islands at the Pleistocene-Holocene transition
The dynamics of hormonal status of developing red beet root (Beta vulgaris L.) in correlation with the dynamics of sugar accumulation
Scenario for a warm, high-CO2 world
Plausible patterns for temperature and precipitation changes accompanying a general global warming, such as might occur due to a large increase in atmospheric carbon dioxide levels, are presented. The patterns are determined by comparing the five warmest years in the period 1925-74 with the five coldest in this period. Temperature increases are indicated for most regions, with maximum warming over northern Asia. A few isolated regions show cooling. Precipitation changes are fairly evenly distributed between increases and decreases; the most important features being an increase over India, and decreases in central and south-central USA and over much of Europe and Russia. The latter decreases, should they occur, could have considerable agricultural impact