noaa-coral-9639
Port Blair, Andaman Islands 1975-2006 Coral Stable Isotope Data
Rixen, T.; Ramachandran, P.; Lehnhoff, L.; Dasbach, D.; Gaye, B.; Urban, B.; Ramachandran, R.; Ittekkot, V.
Port Blair, Andaman Islands 1975-2006 Coral Stable Isotope Data
2010-10-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9639
Investigator
T.
Rixen
Investigator
P.
Ramachandran
Investigator
L.
Lehnhoff
Investigator
D.
Dasbach
Investigator
B.
Gaye
Investigator
B.
Urban
Investigator
R.
Ramachandran
Investigator
V.
Ittekkot
earth science
paleoclimate
corals and sclerosponges
delta 13C,Porites lutea,null,per mil PDB,null,corals and sclerosponges,raw,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
delta 18O,Porites lutea,null,per mil PDB,null,corals and sclerosponges,raw,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
corals and sclerosponges
age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
depth,null,null,millimeter,null,corals and sclerosponges,null,null,N,null
earth science
paleoclimate
corals and sclerosponges
oxygen isotopes
earth science
paleoclimate
corals and sclerosponges
carbon isotopes
geoscientificInformation
Monsoon
1975 AD
2006 AD
-25 cal yr BP
-56 cal yr BP
Complete
11.5048
11.5048
92.6931
92.6931
-6
-6
Ocean
Indian Ocean
Port Blair>LATITUDE 11.5048>LONGITUDE 92.6931
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Rixen, T., P. Ramachandran, L. Lehnhoff, D. Dasbach, B. Gaye,
B. Urban, R. Ramachandran, and V. Ittekkot. 2010.
Impact of monsoon-driven surface ocean processes on a coral
off Port Blair on the Andaman Islands and their link to
North Atlantic climate variations.
Global and Planetary Change.
North Atlantic climate variations are reflected in sedimentary records
from the northern Indian Ocean in which two basins, the Arabian Sea
and the Bay of Bengal, are strongly affected by the monsoon. Contrary
to the Bay of Bengal the Arabian Sea plays an important role in the
global marine nitrogen cycle. In its mid-water oxygen minimum zone (OMZ)
bioavailable fixed nitrogen is reduced to nitrogen gas (NO3- -> N2),
whereas oxygen concentrations are slightly above the threshold of
nitrate reduction in the OMZ of the Bay of Bengal. A coral colony
(Porites lutea) growing south of Port Blair on the Andaman Islands
in the Bay of Bengal was studied for its response to changes in the
monsoon system and its link to temperature changes in the North Atlantic
Ocean, between 1975 and 2006. Its linear extension rates, d13C and d18O
values measured within the coral skeleton reveal a strong seasonality,
which seems to be caused by the monsoon-driven reversal of the surface
ocean circulation. The sampling site appears to be influenced by low
salinity Bay of Bengal Water during the NE monsoon (boreal winter)
and by the high salinity Arabian Sea Water during the SW monsoon
in summer. The high salinity Arabian Sea Water circulates along with
the Summer Monsoon Current (S-MC) from the Arabia Sea into the Bay of
Bengal. Decreasing d18O and reconstructed salinity values correlate to
the increasing SSTs in the North Atlantic Ocean indicating a reduced
influence of the S-MC at the sampling site in the course of northern
hemispheric warming. During such periods oxygen-depletion became
stronger in the OMZ of the Arabian Sea as indicated by the sedimentary
records. A reduced propagation of oxygen-depleted high salinity
Arabian Sea Water into the Bay of Bengal could be a mechanism
maintaining oxygen concentration above the threshold of nitrate
reduction in the OMZ of the Bay of Bengal in times of global warming.
STUDY NOTES: Andaman Islands coral stable isotope data at monthly resolution.
A Porites lutea colony from a reef south of Port Blair was sampled
in March 2006, at a water depth of ~6 m. The core has a diameter
of 6.4 cm and a length of ~37 cm.
The d18O and d13C values were calibrated relative to NBS19
and are given in per mil deviation from the PDB.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/port-blair2010.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/port-blair2010.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11