DELTA 18-O AND DELTA 2-H DIFFERENT TENDENCIES IN ANTARCTIC WATER PRECIPITATIONS.

PARICA, CLAUDIO A.; DAPEÑA, CRISTINA; RINALDI, CARLOS A.

BUENOS AIRES, ARGENTINA

Simposio; XXXI SCAR OPEN SCIENCE CONFERENCE 2010; 2010

Scientific Committee on Antarctic Research (SCAR)

<!-- /* Font Definitions */ @font-face {font-family:Helvetica; panose-1:2 11 6 4 2 2 2 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:536885895 0 0 0 511 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> According the collection of water close to 40 years under its different states some interesting conclusions could be obtained for some spread areas in Antarctica. The southernmost of the Weddell Sea, sampling at Halley Bay (UK) could demonstrate a decreasing tendency in 18O and 2H according a decreasing in temperatures too. On the western side of the Antarctic Peninsula, Vernadski Ukranian Station supports an increasing tendency for isotopes reflecting the increasing in temperatures. The WMWL (World Meteoric Water Line) against the LMWL (Local Meteoric Water Line), because the drifting, support a diffusion model during precipitation. At the South Shetland Islands, argentine stations like Camara (Half Moon Island) and Jubany (25 de Mayo/King George Island), with a shorter time sampling than the other stations could demonstrate through the isotopes an origin of clouds in northern latitudes, like the south Pacific or Drake Passage, also a strong interaction in between rainfalls or snowfalls with the vapour phase (humidity) commonly for islands environment. Both cases have a good correlation in between WMWL and the LMWL supporting a model under equilibrium conditions with a strong incidence of the sea (tendency to zero), with diffusion and some evaporation.