A 2680-year record of sea ice extent in the Ross Sea and the associated atmospheric circulation derived from the DT401 East Antarctic ice core

Abstract

Long time series of Antarctic sea ice extent (SIE) are important for climate research and model forecasting. A historic ice extent in the Ross Sea in early austral winter was rebuilt through sea salt ions in the DT401 ice core in interior East Antarctica. El Niño-Southern Oscillation (ENSO) had a significant influence on the sea salt deposition in DT401 through its influence on the Ross Sea SIE and the transport of sea salt inland. Spectral analysis also supported the influence of ENSO with a significant 2-6 a periodicity band. In addition, statistically significant decadal (10 a) and pentadecadal (50-70 a) periodicities suggested the existence of a teleconnection from the Pacific decadal oscillation (PDO), which originated from sea surface temperature anomalies in the tropical Pacific Ocean. The first eigenvector of the empirical orthogonal function analysis (EOF1) showed lower values during the Medieval Warm Period (MWP), while higher values were found in the Little Ice Age (LIA). A higher frequency of ENSO events were found in the cold climatic stage. The post 1800 AD period was occupied by significant fluctuations of the EOF1, and PDO may be one of the influencing factors. The EOF1 values showed moderate fluctuations from 680 BC to 1000 AD, showing that the climate was relatively stable in this period. sea salt ions, sea ice extent, ENSO, DT401, Eastern Antarctica Citation: Li C J, Ren J W, Xiao C D, Hou S G, Ding M H, Qin D H. 2015. A 2680-year record of sea ice extent in the Ross Sea and the associated atmospheric circulation derived from the DT401 East

Surprising episodic recruitment and growth of Antarctic sponges: Implications for ecological resilience

“…Barry and Dayton (1988) speculated that changes in zonal winds associated with the 1982-83 ENSO event might have been responsible for the strong northerly flows in McMurdo Sound during the 1980s. Li et al (2015) found connections between ENSOs and PDOs in the ice records and suggested the existence of teleconnections from the PDO to McMurdo Sound. There was a large PDO in the late 1990s that correlates nicely with our observations.…”

Supplementary material to "Ice core chemistry database: an Antarctic compilation of sodium and sulphate records spanning the past 2000 years"

“…-77.37 39.70 3810 607 1904 (Motizuki et al, 2017; (Traufetter et al, 2004) DML15C98_14 (FB9814) -75.08 2.50 2970 1766 1996 (Sommer et al, 2000) DML17C98_33 (B33) -75.17 6.50 3160 0 1996 (Sommer et al, 2000) DSS0506 -66.77 112.81 1370 1927 1989 (Vallelonga et al, 2016) DT401 -79.02 77.00 3760 0 1998 (Ren et al, 2010a;Li et al, 2015;Li et al, 2012;Yang et al, 2019; (Bertler et al, 2004;Bertler et al, 2011;Bertler et al, 2005) Vostok5G (Bertler et al, 2004) Table S2. List of sites in the CLIVASH2k chemistry database which have been identified as having a statistically significant correlation with sea ice concentration (SIC), winds (v850 and u850) or geopotential height (z500).…”