Brief communication: Increasing shortwave absorption over the Arctic Ocean is not balanced by trends in the Antarctic

Katlein, Christian; Hendricks, Stefan; Key, Jeffrey R.

doi:10.5194/tc-11-2111-2017

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Besides these reanalysis data sets, we also examine satellite observations of cloud cover. The Advanced Very High Resolution Radiometer Polar Pathfinder-Extended (APP-x) product (Key, 2016;Wang & Key, 2003, 2005a, 2005b contains cloud fraction, which is retrieved at high and low sun times (14:00 and 02:00 local solar time for the Antarctic) using a radiative transfer model and a suite of algorithms (Katlein et al, 2017). The APP-x cloud record on a 25-km Equal-Area Scalable Earth Grid begins in 1982 and continues to the present.…”

Section: Datamentioning

confidence: 99%

The Contributions of Winter Cloud Anomalies in 2011 to the Summer Sea‐Ice Rebound in 2012 in the Antarctic

Wang

Yuan

et al. 2019

JGR Atmospheres

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Unlike the rapid decline of Arctic sea ice in the warming climate, Antarctic sea‐ice extent exhibits a modest positive trend in the period of near four decades. In recent years, the fluctuation in Antarctic sea ice has been strengthened, including a decrease toward the lowest sea‐ice extent in February 2011 for the period of 1978–2016 and a strong rebound in the summer of 2012. The sea‐ice recovery mainly occurs in the Weddell Sea, Bellingshausen Sea, Amundsen Sea, southern Ross Sea, and the eastern Somov Sea. This study offers a new mechanism for this summertime sea‐ice rebound. We demonstrate that cloud‐fraction anomalies in winter 2011 contributed to the positive Antarctic sea‐ice anomaly in summer 2012. The results show that the negative cloud‐fraction anomalies in winter 2011 related to the large‐scale atmospheric circulation resulted in a substantial negative surface‐radiation budget, which cooled the surface and promoted more sea‐ice growth. The sea‐ice growth anomalies due to the negative cloud forcing propagated by sea‐ice motion vectors from September 2011 to January 2012. The distribution of the sea‐ice anomalies corresponded well with the sea‐ice concentration anomalies in February 2012 in the Weddell Sea and eastern Somov Sea. Thus, negative cloud‐fraction anomalies in winter can play a vital role in the following summer sea‐ice distribution.

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Section: Datamentioning

confidence: 99%

The Contributions of Winter Cloud Anomalies in 2011 to the Summer Sea‐Ice Rebound in 2012 in the Antarctic

Wang

Yuan

et al. 2019

JGR Atmospheres

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“…The increased absorption of sunlight through the earth-atmosphere system results in increasing temperature and the warming of the ocean, thereby further causing a decrease in the sea ice extent and surface albedo (SAL). This effect is called ice-albedo feedback [18][19][20]. The Arctic sea ice is becoming thin and young, whereas the sea ice extent in Antarctica has slightly increased over the last four decades [21-23].…”

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The Characteristics of Surface Albedo Change Trends over the Antarctic Sea Ice Region during Recent Decades

2019

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Based on a long-time series (1982–2015) of remote sensing data, we analyzed the change in surface albedo (SAL) during summer (from December to the following February) for the entire Antarctic Sea Ice Region (ASIR) and five longitudinal sectors around Antarctica: (1). the Weddell Sea (WS), (2). Indian Ocean, (3). Pacific Ocean (PO), (4). Ross Sea, and (5). Bellingshausen–Amundsen Sea (BS). Empirical mode decomposition was used to extract the trend of the original signal, and then a slope test method was utilized to identify a transition point. The SAL provided by the CM SAF cloud, Albedo, and Surface Radiation dataset from AVHRR data-Second Edition was validated at Neumayer station. Sea ice concentration (SIC) and sea surface temperature (SST) were also analyzed. The trend of the SAL/SIC was positive during summer over the ASIR and five longitudinal sectors, except for the BS (−2.926% and −4.596% per decade for SAL and SIC, correspondingly). Moreover, the largest increasing trend of SAL and SIC appeared in the PO at approximately 3.781% and 3.358% per decade, respectively. However, the decreasing trend of SAL/SIC in the BS slowed down, and the increasing trend of SAL/SIC in the PO accelerated. The trend curves of the SST exhibited a crest around 2000–2005; thus, the slope lines of the SST showed an increasing–decreasing type for the ASIR and the five longitudinal sectors. The evolution of summer albedo decreased rapidly in the early summer and then maintained a relatively stable level for the whole ASIR. The change of it mainly depended on the early melt of sea ice during the entire summer. The change of sea ice albedo had a narrow range when compared with composite albedo and SIC over the five longitudinal sectors and reached a stable level earlier. The transition point of SAL/SIC in several sectors appeared around the year 2000, whereas that of the SST for the entire ASIR occurred in 2003–2005. A high value of SAL/SIC and a low value of the SST existed in the WS which can be displayed by the spatial distribution of pixel average. In addition, the lower the latitude was, the lower the SAL/SIC and the higher the SST would be. A transition point of SAL appeared in 2001 in most areas of West Antarctica. This transition point could be illustrated by anomaly maps. The spatial distribution of the pixel-based trend of SAL demonstrated that the change in SAL in East Antarctica has exhibited a positive trend in recent decades. However, in West Antarctica, the change of SAL presented a decreasing trend before 2001 and transformed into an increasing trend afterward, especially in the east of the Antarctic Peninsula.

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Analysis of the temporal–spatial changes in surface radiation budget over the Antarctic sea ice region

Zhang

Zhou

Zheng

2019

Science of The Total Environment

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Brief communication: Increasing shortwave absorption over the Arctic Ocean is not balanced by trends in the Antarctic

Cited by 3 publications

References 21 publications

The Contributions of Winter Cloud Anomalies in 2011 to the Summer Sea‐Ice Rebound in 2012 in the Antarctic

The Contributions of Winter Cloud Anomalies in 2011 to the Summer Sea‐Ice Rebound in 2012 in the Antarctic

The Characteristics of Surface Albedo Change Trends over the Antarctic Sea Ice Region during Recent Decades

Analysis of the temporal–spatial changes in surface radiation budget over the Antarctic sea ice region

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