Effects of Northern Hemisphere Atmospheric Blocking on Arctic Sea Ice Decline in Winter at Weekly Time Scales

Yao, Yao; Luo, Dehai; Zhong, Linhao

doi:10.3390/atmos9090331

Cited by 16 publications

(13 citation statements)

References 30 publications

(46 reference statements)

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“…The regions of cold and warm anomalies found in this study are in accordance with Papritz and Grams (), who pointed out more cold outbreaks in the Norwegian Sea during the regime GB and in southern Greenland during the regime Zo. Our results also corroborates the study of Yao et al () identifying strong warm anomalies increased by downwards IR over the western part of high‐pressure systems.…”

Section: Discussionsupporting

confidence: 93%

“…The regime contribution to the temperature trend is low compared to Norway or northeastern Canada, which can be attributed to a very low inter‐regime variability in terms of atmospheric water content and downwards IR anomalies (Figure ). The low contribution of atmospheric circulation in the Spitsbergen warming seems to be in contradiction with previous studies stating that EB is associated with high temperature in this region, due to advections of wet air increasing downwards IR (Luo et al , ; Rinke et al , ; Yao et al , ). Dahlke and Maturilli () estimate that 22% of the warming in Ny Ålesund (Spitsbergen) relates to an increase of EB.…”

Section: Discussioncontrasting

confidence: 90%

“…During winter, temperature extremes observed in past years have been partly attributed to atmospheric circulation (Isaksen et al , ; Overland and Wang, ; Ogawa et al , ; Sun et al , ). Generally, atmospheric patterns accompanied with increased water vapour may enhance downwards infrared radiations (IR), increasing temperature in winter (Yao et al , ). Following this mechanism, the strong warming over the Barents Sea was partly attributed to the temporal persistence of a Blocking over the Ural region (Luo et al , ), primarily in conjunction with a positive phase of the NAO (Luo et al , ).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region

Champagne

Pohl

McKenzie

et al. 2019

Intl Journal of Climatology

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The Arctic region has experienced significant warming during the past two decades with major implications on the cryosphere. The causes of Arctic amplification are still an open question within the scientific community, attracting recent interest. The goal of this study is to quantify the contribution of atmospheric circulation on temperature variability in the Atlantic–Arctic region at decadal to intra‐annual timescales from 1951 to 2014. Daily 20th Century reanalyses geopotential height anomalies at 500 hPa were clustered into different weather regimes to assess their contribution to observed temperature variability. The results show that in winter, 25% of the warming (cooling) in the North Atlantic Ocean (northeastern Canada) is due to temporal decreases of high geopotential anomalies in Greenland. This regime influences air mass migration patterns, bringing less cold (warm) air masses into these regions. Additionally, atmospheric warming or cooling has been attributed to a change in nearby oceanic basin surface conditions because of sea ice decline. In summer, about 15% of the warming observed in Norwegian/Greenland Seas is related to an increase in temporal anticyclonic patterns. This ratio reaches 37% in Norway due to an amplification from downwards solar radiation. This study allows for better understanding how natural climate variability modulates the regional signature of climate change and estimating the uncertainties in climate projections.

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Section: Discussionsupporting

confidence: 93%

Section: Discussioncontrasting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region

Champagne

Pohl

McKenzie

et al. 2019

Intl Journal of Climatology

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“…The Ural blocking with the positive (negative) phase of NAO is associated with higher (lower) intrusion of moisture into the BKS region (Luo et al, , statistically significant at the 95% confidence level from the Student's t‐ test). Yao, Luo, and Zhong () associated atmospheric blocking in the northern hemisphere with a decline in sea ice. They reported that blocking the circulation strengthens the transport of moisture and heat to the Arctic system (significant at the 95% confidence level).…”

Section: Drivers Of Observed Changes In Moisture Transport To the Arcmentioning

confidence: 99%

Atmospheric moisture transport and the decline in Arctic Sea ice

Gimeno

Vázquez

Eiras‐Barca

et al. 2019

WIREs Climate Change

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This article contains a review of the transport of moisture to the Arctic and its effect on Arctic Sea Ice Extent (SIE). The review includes a synthesis of our knowledge regarding the main sources supplying moisture to the Arctic, the changes experienced over the last few decades due to variations in the transport of moisture, the factors that control interannual variability, and the inherent contrast in the mechanisms related to the effect of changes in moisture transport on SIE in the Arctic. We note that the precise identification of the moisture sources for the Arctic depends both on the definition of the Arctic region itself and on the approach used to identify the sources, with the remote regions over the extratropical Atlantic and Pacific Oceans being universally important, as are some continental areas over Siberia and North America. This review also reaffirms the absence of any clear agreement regarding the trends in atmospheric moisture transport to the Arctic, and highlights discrepancies between different data sets and approaches in the quantification of moisture transport, implying that its long‐term impact on the intensification of the hydrological cycle in the Arctic remains unclear. We confirm the influence of the major modes of climate variability, planetary circulation patterns, and the changes in cyclonic activity in the variability of moisture transport to the Arctic. We reaffirm that the effect of moisture transport on the Arctic SIE through changes in humidity, cloud cover, and precipitation over the Arctic is a complex scientific problem that requires further detailed study over the decades to come, and we propose some important challenges for future research. This article is categorized under: Paleoclimates and Current Trends > Modern Climate Change

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“…However, the short observational period (40 years) relative to the time scales of AMO or PDO is difficult to find statistically significant relationships between the weather systems and decadal oceanic modes of variability [16]. On the other hand, the literature [28] indicates that the sea ice cover (SIC) is closely related to blocking frequency. The composite SIC anomaly in January during three periods conclude that the sea ice cover area in the Bering Sea is lower (higher) in the higher (lower) blocking frequency period.…”

Section: Discussionmentioning

confidence: 99%

The Spatio—Temporal Variation of Pacific Blocking Frequency within Winter Months and Its Relationship with Surface Air Temperature

Gao

Yang

2020

Atmosphere

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The spatio–temporal evolution of the Pacific blocking frequency (PBF) that is based on a two–dimensional blocking index is investigated during the recent 40–winter (1979/80–2018/19) months (December–January–February). It is found that maximum PBF appears in January within the key area of 140° E–160° W, 50°–70° N. The key–area Pacific blocking in January is more active during the first (1980–1988) and the third (2009–2019) periods than during the second period (1989–2008). There is a positive 500 hPa–geopotential height (Z500) anomaly over the mid–latitude Pacific and a negative one over the high latitude area between the first two periods (second minus first). This pattern can cause an anomalous westerly circulation over the mid–high Pacific sector, which indicates a weakening of the Pacific blocking activity during the second period. This connects to a positive two–meter air temperature (T2m) anomaly over the northeastern Asia and mid–western Pacific, and a negative one over the high–latitude area. The difference of Z500 between the third and the second periods (third minus first) is opposite to that between the second and the first periods, which leads to more Pacific blocking events during the third period. This is related to a positive T2m anomaly over the high–latitude area and a negative one over the mid–latitude area of Asia and the western Pacific. Furthermore, the correlation coefficient between the variables (Z500, T2m, 200 hPa–zonal wind) and the key–area PBF confirms the above results.

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Effects of Northern Hemisphere Atmospheric Blocking on Arctic Sea Ice Decline in Winter at Weekly Time Scales

Cited by 16 publications

References 30 publications

Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region

Atmospheric circulation modulates the spatial variability of temperature in the Atlantic–Arctic region

Atmospheric moisture transport and the decline in Arctic Sea ice

The Spatio—Temporal Variation of Pacific Blocking Frequency within Winter Months and Its Relationship with Surface Air Temperature

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