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Tropical forcing of Circumpolar Deep Water Inflow and outlet glacier thinning in the Amundsen Sea Embayment, West Antarctica

  • E.J. Steig (a1), Q. Ding (a1), D.S. Battisti (a2) (a3) and A. Jenkins (a4)

Outlet glaciers draining the Antarctic ice sheet into the Amundsen Sea Embayment (ASE) have accelerated in recent decades, most likely as a result of increased melting of their ice-shelf termini by warm Circumpolar Deep Water (CDW). An ocean model forced with climate reanalysis data shows that, beginning in the early 1990s, an increase in westerly wind stress near the continental shelf edge drove an increase in CDW inflow onto the shelf. The change in local wind stress occurred predominantly in fall and early winter, associated with anomalous high sea-level pressure (SLP) to the north of the ASE and an increase in sea surface temperature (SST) in the central tropical Pacific. The SLP change is associated with geopotential height anomalies in the middle and upper troposphere, characteristic of a stationary Rossby wave response to tropical SST forcing, rather than with changes in the zonally symmetric circulation. Tropical Pacific warming similar to that of the 1990s occurred in the 1940s, and thus is a candidate for initiating the current period of ASE glacier retreat.

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      Tropical forcing of Circumpolar Deep Water Inflow and outlet glacier thinning in the Amundsen Sea Embayment, West Antarctica
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Bleck R., Rooth C., Hu D.M. and Smith L.T.. (1992) Salinity-driven thermocline transients in a wind-forced and thermohaline forced isopycnic coordinate model of the North Atlantic. J. Phys. Oceanogr., 22(12), 1486–1505.
Bromwich D.H. and Fogt R.L.. (2004) Strong trends in the skill of the ERA-40 and NCEP NCAR reanalyses in the high and midlatitudes of the southern hemisphere. J. Climate, 17(23), 4603–4619.
Comiso J.C. and Nishio F.. (2008) Trends in the sea ice cover using enhanced and compatible AMSR-E, SSM/I, and SMMR data. J. Geophys. Res., 113(C2), C02S07. (10.1029/2007JC004257.)
Ding Q., Steig E.J., Battisti D.S. and Küttel M.. (2011) Winter warming in West Antarctica caused by central tropical Pacific warming. Nature Geosci., 4(6), 398–403.
Fogt R.L. and Bromwich D.H.. (2006) Decadal variability of the ENSO teleconnection to the high-latitude South Pacific governed by coupling with the Southern Annular Mode. J. Climate, 19(6), 979–997.
Fogt R.L., Bromwich D.H. and Hines K.M.. (2011) Understanding the SAM influence on the South Pacific ENSO teleconnection. Climate Dyn., 36(7–8), 1555–1576.
Gill A.E. (1980) Some simple solutions for heat-induced tropical circulation. Q. J. R. Meteorol. Soc., 106(449), 447–462.
Gillett N.P. and Thompson D.W.J.. (2003) Simulation of recent Southern Hemisphere climate change. Science, 302(5643), 273–275.
Grassi B., Redaelli G. and Visconti G.. (2005) Simulation of Polar Antarctic trends: influence of tropical SST. Geophys. Res. Lett., 32(23), L23806. (10.1029/2005GL023804.)
Holland D.M. and Jenkins A.. (2001) Adaptation of an isopycnic coordinate ocean model for the study of circulation beneath ice shelves. Mon. Weather Rev., 129(8), 1905–1927.
Hoskins B.J. and Karoly D.J.. (1981) The steady linear response of a spherical atmosphere to thermal and orographic forcing. J. Atmos. Sci., 38(14), 2150–2163.
Hughes T.J. (1979) Reconstruction and disintegration of ice sheets for the CLIMAP 18 000 and 125 000 years B.P. experiments: theory. J. Glaciol., 24(90), 493–495.
Hughes T.J. (1981) Correspondence. The weak underbelly of the West Antarctic ice sheet. J. Glaciol., 27(97), 518–525.
Jacobs S.S., Hellmer H.H., Doake C.S.M., Jenkins A. and Frolich R.M.. (1992) Melting of ice shelves and the mass balance of Antarctica. J. Glaciol., 38(130), 375–387.
Jacobs S.S., Hellmer H.H. and Jenkins A.. (1996) Antarctic ice sheet melting in the southeast Pacific. Geophys. Res. Lett., 23(9), 957–960.
Jacobs S.S., Jenkins A., Giulivi C.F. and Dutrieux P.. (2011) Stronger ocean circulation and increased melting under Pine Island Glacier ice shelf. Nature Geosci., 4(8), 519–523.
Jenkins A. and 6 others. (2010) Observations beneath Pine Island Glacier in West Antarctica and implications for its retreat. Nature Geosci., 3(7), 468–472.
Joughin I., Rignot E., Rosanova C.E., Lucchitta B.K. and Bohlander J.. (2003) Timing of recent accelerations of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 30(13), 1706. (10.1029/2003GL017609.)
Joughin I., Smith B.E. and Holland D.M.. (2010) Sensitivity of 21st century sea level to ocean-induced thinning of Pine Island Glacier, Antarctica. Geophys. Res. Lett., 37(20), L20502. (10.1029/2010GL044819.)
Kalnay E. and 21 others. (1996) The NCEP/NCAR 40-year reanalysis project. Bull. Am. Meteorol. Soc., 77(3), 437–471.
Kanamitsu M. and 6 others. (2002) NCEP-DOE AMIP-II Reanalysis (R-2). Bull. Am. Meteorol. Soc., 83(11), 1631–1643.
Keeley S.P.E., Gillett N.P., Thompson D.W.J., Solomon S. and Forster P.M.. (2007) Is Antarctic climate most sensitive to ozone depletion in the middle or lower stratosphere? Geophys. Res. Lett., 34(22), L22812. (10.1029/2007GL031238.)
Kellogg T.B. and Kellogg D.E.. (1987) Recent glacial history and rapid ice stream retreat in the Amundsen Sea. J. Geophys. Res., 92(B9), 8859–8864.
Klinck J.M. and Dinniman M.S.. (2010) Exchange across the shelf break at high southern latitudes. Ocean Sci., 6(2), 513–514.
L’Heureux M.L. and Thompson D.W.J.. (2006) Observed relationships between the El Niño–Southern Oscillation and the extratropical zonal-mean circulation. J. Climate, 19(2), 276–287.
Lachlan-Cope T. and Connolley W.. (2006) Teleconnections between the tropical Pacific and the Amundsen–Bellinghausen Sea: role of the El Niño/Southern Oscillation. J. Geophys. Res., 111(D23), D23101. (10.1029/2005JD006386.)
Lingle C.S. and Clark J.A.. (1979) Antarctic ice-sheet volume at 18 000 years B.P. and Holocene sea-level changes at the West Antarctic margin. J. Glaciol., 24(90), 213–230.
Lythe M.B., Vaughan D.G. and BEDMAP consortium. (2001) BEDMAP: a new ice thickness and subglacial topographic model of Antarctica. J. Geophys. Res., 106(B6), 11 335–11 351.
Marshall G.J. (2003) Trends in the Southern Annular Mode from observations and reanalyses. J. Climate, 16(24), 4134–4143.
Mo K.C. and Higgins R.W.. (1998) The Pacific–South American modes and tropical convection during the Southern Hemisphere winter. Mon. Weather Rev., 126(6), 1581–1596.
Naish T. and 55 others. (2009) Obliquity-paced Pliocene West Antarctic ice sheet oscillations. Nature, 458(7236), 322–328.
Nitsche F.O., Jacobs S.S., Larter R.D. and Gohl K.. (2007) Bathymetry of the Amundsen Sea continental shelf: implications for geology, oceanography, and glaciology. Geochem. Geophys. Geosyst., 8(Q10), Q10009. (10.1029/2007GC001694.)
Payne A.J., Vieli A., Shepherd A., Wingham D.J. and Rignot E.. (2004) Recent dramatic thinning of largest West Antarctic ice stream triggered by oceans. Geophys. Res. Lett., 31(23), L23401. (10.1029/2004GL021284.)
Pollard D. and DeConto R.M.. (2009) Modelling West Antarctic ice sheet growth and collapse through the past five million years. Nature, 458(7236), 329–332.
Pritchard H.D., Arthern R.J., Vaughan D.G. and Edwards L.A.. (2009) Extensive dynamic thinning on the margins of the Greenland and Antarctic ice sheets. Nature, 461(7266), 971–975.
Rignot E.J. (1998) Fast recession of a West Antarctic glacier. Science, 281(5376), 549–551.
Rignot E. (2001) Evidence for rapid retreat and mass loss of Thwaites Glacier, West Antarctica. J. Glaciol., 47(157), 213–222.
Rignot E. (2002) Ice-shelf changes in Pine Island Bay, Antarctica, 1947–2000. J. Glaciol., 48(161), 247–256.
Rignot E. (2008) Changes in West Antarctic ice stream dynamics observed with ALOS PALSAR data. Geophys. Res. Lett., 35(12), L12505. (10.1029/2008GL033365.)
Rignot E. and 6 others. (2008) Recent Antarctic ice mass loss from radar interferometry and regional climate modelling. Nature Geosci., 1(2), 106–110.
Sardeshmukh P.D. and Hoskins B.J.. (1988) The generation of global rotational flow by steady idealized tropical divergence. J. Atmos. Sci., 45(7), 1228–1251.
Scherer R.P., Aldahan A., Tulaczyk S., Possnert G., Engelhardt H. and Kamb B.. (1998) Pleistocene collapse of the West Antarctic ice sheet. Science, 281(5373), 82–85.
Schmeltz M., Rignot E., Dupont T.K. and MacAyeal D.R.. (2002) Sensitivity of Pine Island Glacier , West Antarctica, to changes in ice-shelf and basal conditions: a model study. J. Glaciol., 48(163), 552–558.
Schneider D.P. and Steig E.J.. (2008) Ice cores record significant 1940s Antarctic warmth related to tropical climate variability. Proc. Natl Acad. Sci. USA (PNAS), 105(34), 12 154–12 158.
Schneider D.P., Deser C. and Olumura Y.. (2011) An assessment and interpretation of the observed warming of West Antarctica in the austral spring. Climate Dyn. (10.1007/s00382-010-0985-x.)
Schoof C. (2007) Ice sheet grounding line dynamics: steady states, stability, and hysteresis. J. Geophys. Res., 112(F3), F03S28. (10.1029/2006JF000664.)
Scott J.B.T., Gudmundsson G.H., Smith A.M., Bingham R.G., Pritchard H.D. and Vaughan D.G.. (2009) Increased rate of acceleration on Pine Island Glacier is strongly coupled to thinning induced changes in driving stress. Cryosphere, 3(1), 125–131.
Shepherd A., Wingham D. and Mansley J.A.. (2002) Inland thinning of the Amundsen Sea sector, West Antarctica. Geophys. Res. Lett., 29(10), 1364. (10.1029/2001GL014183.)
Shepherd A., Wingham D. and Rignot E.. (2004) Warm ocean is eroding West Antarctic Ice Sheet. Geophys. Res. Lett., 31(23), L23404. (10.1029/2004GL021106.)
Sigmond M. and Fyfe J.C.. (2010) Has the ozone hole contributed to increased Antarctic sea ice extent? Geophys. Res. Lett., 37(18), L18502. (10.1029/2010GL044301.)
Simmonds I. (2003) Modes of atmospheric variability over the Southern Ocean. J. Geophys. Res., 108(C4), 8078. (10.1029/2000JC000542.)
Simmonds I. and King J.C.. (2004) Global and hemispheric climate variations affecting the Southern Ocean. Antarct. Sci., 16(4), 401–413.
Smith T.M., Reynolds R.W., Peterson T.C. and Lawrimore J.. (2008) Improvements to NOAA’s Historical Merged Land–Ocean Surface Temperature Analysis (1880–2006). J. Climate, 21(10), 2283–2296.
Son S.-W. and 9 others. (2008) The impact of stratospheric ozone recovery on the Southern Hemisphere westerly jet. Science, 320(5882), 1486–1489.
Steig E.J., Schneider D.P., Rutherford S.D., Mann M.E., Comiso J.C. and Shindell D.T.. (2009) Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year. Nature, 457(7228), 459–462.
Thoma M., Jenkins A., Holland D. and Jacobs S.. (2008) Modelling Circumpolar Deep Water intrusions on the Amundsen Sea continental shelf, Antarctica. Geophys. Res. Lett., 35(18), L18602. (10.1029/2008GL034939.)
Thomas R.H., Rignot E.J., Kanagaratnam K., Krabill W.B. and Casassa G.. (2004) Force-perturbation analysis of Pine Island Glacier, Antarctica, suggests cause for recent acceleration. Ann. Glaciol., 39, 133–138.
Thompson D.W.J. and Solomon S.. (2002) Interpretation of recent Southern Hemisphere climate change. Science, 296(5569), 895–899.
Thomson D.J. (1982) Spectrum estimation and harmonic analysis. IEEE Proc., 70, 1055–1096.
Trenberth K.E. (1984) Signal versus noise in the Southern Oscillation. Mon. Weather Rev., 112(2), 326–332.
Trenberth K.E. and Hoar T.J.. (1997) El Niño and climate change. Geophys. Res. Lett., 24(23), 3057–3060.
Turner J. and 8 others. (2009) Non-annular atmospheric circulation change induced by stratospheric ozone depletion and its role in the recent increase of Antarctic sea ice extent. Geophys. Res. Lett., 36(8), L08502. (10.1029/2009GL037524.)
Uppala S.M. and 45 others. (2005) The ERA-40 re-analysis. Q. J. R. Meteorol. Soc., 131(612), 2961–3212.
Uppala S., Dee D., Kobayashi S., Berrisford P. and Simmons A.. (2008) Towards a climate data assimilation system: status update of ERA-Interim. ECMWF Newsl. 115, 12–18.
Van den Broeke M.R. (2000) The semiannual oscillation and Antarctic climate. Part 4: a note on sea ice cover in the Amundsen and Bellingshausen Seas. Int. J. Climatol., 20(4), 455–462.
Wingham D.J., Ridout A.L., Scharroo R., Arthern R.J. and Shum C.K.. (1998) Antarctic elevation change from 1992 to 1996. Science, 282(5388), 456–458.
Wingham D.J., Wallis D.W. and Shepherd A.. (2009) Spatial and temporal evolution of Pine Island Glacier thinning, 1995–2006. Geophys. Res. Lett., 36(17), L17501. (10.1029/2009GL039126.)
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