Changes in summer sea ice, albedo, and portioning of surface solar radiation in the Pacific sector of Arctic Ocean during 1982–2009

Lei, Ruibo; Tian-Kunze, Xiangshan; Leppäranta, Matti; Wang, Jia; Kaleschke, Lars; Zhang, Zhanhai

doi:10.1002/2016jc011831

Cited by 43 publications

(41 citation statements)

References 48 publications

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“…These findings could be partly explained by the presence of deep cyclones, which would efficiently break up and export the sea ice equatorward [85]. However, after a slightly decease before mid-December, the sea ice albedo maintained a relatively stable level (60%) and reached a stable level earlier, at approximately one month before composite albedo, which was similar to that in the Arctic reported by Lei et al (2016). Consistent with other studies [14,21,92], the composite albedo and SIC in BS presented a steady decreasing trend during the entire summer.…”

Section: Seasonal Evolution Of Composite Albedo Sic and Sea Ice Albedosupporting

confidence: 86%

“…Because positive sea-level pressure anomalies and northward winds appeared in the Southern Atlantic Ocean [7], the SIC in the WS was high during summer ( Figure 10b); thus, the high SAL could also be found in the WS (Figure 10a) [37,83]. Moreover, the low values of the SST existed in the WS (Figure 10c), thereby indicating that the spatial correlation between the SAL and the SIC was significantly positive, and that between SAL/SIC and SST was negative [99]. The low pixel average of SAL/SIC and high pixel average of the SST appeared on the edge of the sea ice, which was largely due to the solar radiation that was absorbed when the latitude was low [31], and positive (negative) cyclone density anomalies emerged around Antarctica (mid-latitudes) [85].…”

Section: Spatial Distributionmentioning

confidence: 93%

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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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Section: Seasonal Evolution Of Composite Albedo Sic and Sea Ice Albedosupporting

confidence: 86%

Section: Spatial Distributionmentioning

confidence: 93%

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

2019

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“…The ice-free sea surface has little difference in albedo under cloudy and clear-sky weather conditions (Grenfell and Perovich, 2004). Compared with the downward trend of the clear-sky albedo, the effect of increasing cloud fractional cover on all-sky albedo is small and can be neglected (Lei et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…In most years in the other regions, the albedos were larger in July than in August (Table 1). Due to the accumulation of solar radiation in the ocean system, icealbedo feedback is stronger in the late summer than in the early summer, so the long-term trend of delayed sea ice freezing is more obvious than the trend of advanced melting (Lei et al, 2016). In the Arctic Ocean in August, the area that had been frozen in the past is in a state of ice melting, and the timing of the sea ice surface freezing is delayed, which makes the sea ice region albedo in August smaller than before.…”

Section: Discussionmentioning

confidence: 99%

Summer albedo variations in the Arctic Sea ice region from 1982 to 2015

Peng

Shen

et al. 2019

Intl Journal of Climatology

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The spatiotemporal changes in the sea ice region albedo over the entire Arctic region and in eight subregions (the Central Arctic Ocean [CAO], the Beaufort and Chukchi Seas [BC], the East Siberian and Laptev Seas [ESL], Baffin Bay and Labrador Sea [BL], the Canadian Archipelago [CA], the Greenland Sea [GS], Hudson Bay [HB] and the Kara and Barents Seas [KB]) in the summer of 1982-2015 are analysed with CLARA-A2-SAL data. The results indicate that in the summer of 1982-2015, the Arctic Sea ice region albedo fluctuated with a downward trend of −1.6% per decade (significance level of 99%). The BC had the largest decline in the albedo trend of −2.7% per decade (significance level of 99%), and most other subregions had downward trends except the GS, which exhibited a slight upward trend. The mean Arctic Sea ice region albedo was 44%. The high albedo areas were mainly concentrated in the CAO and the vicinity of Greenland. The albedo decreased with decreasing latitude, while the low-value areas were mainly concentrated in the outer sea ice area. In the Arctic region, both the sea ice concentration (SIC) and the sea ice extent (SIE) showed a decreasing trend, while the near-surface air temperature (NSAT) and the summer Central Arctic Index (CAI) showed an increasing trend. The Arctic Sea ice region albedo was positively correlated with the SIC and the SIE (0.84, 0.78) and negatively correlated with the NSAT (−0.72), all with a statistical significance level of 99%. The correlation between sea ice region albedo and the summer CAI revealed different relationships in these regions. The BC and ESL had a significant negative correlation, and the GS showed a significant positive correlation. These findings indicated that the decrease in albedo is closely related to the reduction in Arctic Sea ice and the increase in air temperature. In addition, the sea ice region albedo variations in the BC, ESL and GS are also greatly influenced by atmospheric circulation. K E Y W O R D Salbedo, Arctic Sea ice region, Central Arctic Index, near-surface air temperature, sea ice concentration, trend

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“…5d). Assuming an albedo of 0.3, 0.7, and 0.1 for melt pond, sea ice, and open water according to Lei et al (2016), respectively, and ice concentration of 95%, reductions of regional average albedo by melt ponds and open water are 17% and 4%, respectively. Thus, melt ponds had much greater impact on the reduction of albedo than open water in this region.…”

Section: Sea Ice Morphology Along Ship Trackmentioning

confidence: 99%

Characterization of summer Arctic sea ice morphology in the 135°–175°W sector using multi-scale methods

Lei

Tian-Kunze

et al. 2017

Cold Regions Science and Technology

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Changes in summer sea ice, albedo, and portioning of surface solar radiation in the Pacific sector of Arctic Ocean during 1982–2009

Cited by 43 publications

References 48 publications

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

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

Summer albedo variations in the Arctic Sea ice region from 1982 to 2015

Characterization of summer Arctic sea ice morphology in the 135°–175°W sector using multi-scale methods

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