The fluctuation in primary production and mineral dust accumulation was estimated to better understand marine and terrestrial environments in the Tasman Sea, southwest Pacific, during the Late Pleistocene. Maxima in primary production were observed during late Oxygen Isotope Stage (OIS) 2, middle OIS 4 and late OIS 6 for core NGC 97 while minimum values were observed in OIS 5. On the other hand, primary production was low and relatively uniform in cores NGC 100 and 99 during the last 180 kyr. These results suggest that the Tasman Front existed between NGC 99 (∼30°S) and NGC 97 (∼35°S) during the last 180 kyr and migrated northward by a few degree (∼2–3° latitude) in OIS 2 and 4. The mass accumulation rates (MARs) of mineral aerosol (MAR aerosol ) estimated from the Al concentration increased southward during each OIS (excluding OIS 2 in cores NGC 100 and 99). The MAR aerosol was more enhanced during glacials than interglacials in cores NGC 100 and 97 while NGC 99 showed no definite fluctuation. These results suggest small northward shifts (∼2–3° latitude) of the high pressure subtropical ridge, dividing the tropical easterly circulation from the mid-latitude westerlies, took place during glacial times. These results demonstrate that the boundary between subtropical and temperate features in both ocean and atmosphere consistently migrated by a few degrees between glacials and interglacials. In addition, profiles of MAR of organic carbon, biogenic opal and primary productivity were quite similar for cores NGC 97 and S2612 (32°19.84′N, 157°51.00′E), which shows that the boreal and austral transition zones between subtropical and subarctic waters migrated almost synchronously along the latitudinal transect around 160°E during the last 150 kyr (Kawahata et al., J. Oceanogr. 55 (1999) 521–532). Therefore boreal and austral mid-latitudes could have probably experienced similar fluctuations in the oceanic and atmospheric environments.
"Palaeogeography, Palaeoclimatology, Palaeoecology" – Elsevier
Published: Aug 15, 2002
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera