scholarly journals Atmospheric deposition fluxes of 26 elements over the Southern Indian Ocean: Time series on Kerguelen and Crozet Islands

2013 ◽  
Vol 27 (2) ◽  
pp. 440-449 ◽  
Author(s):  
Alexie Heimburger ◽  
Rémi Losno ◽  
Sylvain Triquet ◽  
Elisabeth Bon Nguyen
Keyword(s):  
Time Series ◽  
Indian Ocean ◽  
Atmospheric Deposition ◽  
Southern Indian Ocean ◽  
Deposition Fluxes

Continuous flow analysis of the Mount Brown South ice core

2021 ◽  
Author(s):  
Margaret Harlan ◽  
Helle Astrid Kjær ◽  
Tessa Vance ◽  
Paul Vallelonga ◽  
Vasileios Gkinis ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Size Distribution ◽  
Continuous Flow ◽  
Ice Core ◽  
Flow Analysis ◽  
East Antarctica ◽  
Southern Indian Ocean ◽  
Indian Ocean Region ◽  
Continuous Flow Analysis ◽  
Ocean Region

<p>The Mount Brown South (MBS) ice core is an approximately 300-meter-long ice core, drilled in 2016-2017 to the south of Mount Brown, Wilhelm II Land, East Antarctica. This location in East Antarctica was chosen as it produces an ice core with well-preserved sub-annual records of both chemistry and isotope concentrations, spanning back over 1000 years. MBS is particularly well suited to represent climate variations of the Indian Ocean sector of Antarctica, and to provide information about regional volcanism in the Southern Indian Ocean region.</p><p>A section of ice spanning the length of the MBS core was melted as part of the autumn 2019 continuous flow analysis (CFA) campaign at the Physics of Ice, Climate, and Earth (PICE) group at the University of Copenhagen. During this campaign, measurements were conducted for chemistry and impurities contained in the ice, in addition to water isotopes. The data measured in Copenhagen include measurements of H<sub>2</sub>O<sub>2,</sub> pH, electrolytic conductivity, and NH<sub>4</sub><sup>+</sup>, Ca<sup>2+</sup>, and Na<sup>+</sup> ions, in addition to insoluble particulate concentrations and size distribution measured using an Abakus laser particle counter.</p><p>Here, we present an overview of the CFA chemistry and impurity data, as well as preliminary investigations into the size distribution of insoluble particles and the presence of volcanic material within the ice. These initial chemistry and particulate size distribution data sets are useful in order to identify sections of the MBS core to subject to further analysis to increase our understanding of volcanic activity in the Southern Indian Ocean region.</p>

Formation and Evolution of Microcontinents of the Kerguelen Plateau, Southern Indian Ocean

Geotectonics ◽  
2018 ◽  
Vol 52 (5) ◽  
pp. 499-515 ◽  
Author(s):  
G. L. Leitchenkov ◽  
E. P. Dubinin ◽  
A. L. Grokholsky ◽  
G. D. Agranov
Keyword(s):  
Indian Ocean ◽  
Southern Indian Ocean ◽  
Kerguelen Plateau ◽  
Formation And Evolution

scholarly journals Convective Characteristics of the Madden–Julian Oscillation over the Central Indian Ocean Observed by Shipborne Radar during DYNAMO

2014 ◽  
Vol 71 (8) ◽  
pp. 2859-2877 ◽  
Author(s):  
Weixin Xu ◽  
Steven A. Rutledge
Keyword(s):  
Time Series ◽  
Indian Ocean ◽  
Phase 1 ◽  
Deep Convection ◽  
Tropical Rainfall Measuring Mission ◽  
Heavy Precipitation ◽  
Upper Troposphere ◽  
Central Indian Ocean ◽  
Radar Echo ◽  
Two Phases

Abstract This study investigates the convective population and environmental conditions during three MJO events over the central Indian Ocean in late 2011 using measurements collected from the Research Vessel (R/V) Roger Revelle deployed in Dynamics of the MJO (DYNAMO). Radar-based rainfall estimates from the Revelle C-band radar are first placed in the context of larger-scale Tropical Rainfall Measuring Mission (TRMM) rainfall data to demonstrate that the reduced Revelle radar range captured the MJO convective evolution. Time series analysis and MJO phase-based composites of Revelle measurements both support the “recharge–discharge” MJO theory. Time series of echo-top heights indicate that convective deepening during the MJO onset occurs over a 12–16-day period. Composite statistics show evident recharging–discharging features in convection and the environment. Population of shallow/isolated convective cells, SST, CAPE, and the lower-tropospheric moisture increase (recharge) substantially approximately two to three phases prior to the MJO onset. Deep and intense convection and lightning peak in phase 1 when the sea surface temperature and CAPE are near maximum values. However, cells in this phase are not well organized and produce little stratiform rain, possibly owing to reduced shear and a relatively dry upper troposphere. The presence of deep convection leads the mid- to upper-tropospheric humidity by one to two phases, suggesting its role in moistening these levels. During the MJO onset (i.e., phase 2), the mid- to upper troposphere becomes very moist, and precipitation, radar echo-top heights, and the mesoscale extent of precipitation all increase and obtain peak values. Persistent heavy precipitation in these active periods helps reduce the SST and dry/stabilize (or discharge) the atmosphere.

scholarly journals Recent 210 Pb, 137 Cs and 241 Am accumulation in an ombrotrophic peatland from Amsterdam Island (Southern Indian Ocean)

2017 ◽  
Vol 175-176 ◽  
pp. 164-169 ◽  
Author(s):  
Chuxian Li ◽  
Gaël Le Roux ◽  
Jeroen Sonke ◽  
Pieter van Beek ◽  
Marc Souhaut ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Southern Indian Ocean ◽  
Ombrotrophic Peatland

scholarly journals Diazotroph community and activity in the Southern Indian Ocean

2022 ◽  
Author(s):  
SUBHADEEP CHOWDHURY ◽  
Hugo Berthelot ◽  
Stéphane L'Helguen ◽  
Jean-François Maguer ◽  
Carolin Löscher ◽  
...  
Keyword(s):  
Indian Ocean ◽  
Southern Indian Ocean

scholarly journals Diet and feeding ecology of blue petrels Halobaena caerulea at Iles Kerguelen, Southern Indian Ocean

2002 ◽  
Vol 228 ◽  
pp. 283-299 ◽  
Author(s):  
Y Cherel ◽  
P Bocher ◽  
C Trouvé ◽  
H Weimerskirch
Keyword(s):  
Indian Ocean ◽  
Feeding Ecology ◽  
Southern Indian Ocean
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