Calendar Options

Calendar Views

Submit Events

System Calendars

Systemwide Events Calendar

Special Oceanography Seminar

May 14, 2:30pm - 3:30pm
Manoa Campus, Marine Sciences Building, MSB 100

Dr. Kim Cobb*
Associate Professor
Georgia Inst. of Technology

“Coral estimates of central tropical Pacific temperature over the last millennium: the good, the bad, and the ugly”

Abstract: Robust estimates of tropical Pacific sea-surface temperatures through the recent centuries are critical for the detection and attribution of anthropogenic climate change in this key region, yet have thus far proven elusive. Corals provide a wealth of environmental information over the past several centuries, in the case of living colonies, and many millennia, in the case of fossil corals. Specifically, coral Sr/Ca is a well-established proxy for sea-surface temperature, which when combined with coral oxygen isotopic composition (18O), can provide much-needed estimates of past seawater 18O variations (the latter closely related to salinity). Here we apply paired Sr/Ca and 18O analyses to a large, well-characterized collection of coral cores from Palmyra Island (6N, 162W) (e.g. Cobb et al., 2001; Cobb et al., 2003). We uncover a significant trend in 20th century seawater 18O indicative of regional freshening, consistent with model projections of increased P-E in this region in response to greenhouse forcing. In applying this approach to the fossil coral collection, we highlight a number of obstacles that must be overcome prior to obtaining robust coral Sr/Ca-based estimates of paleo-SST from fossil corals, and suggest strategies for reducing those sources of uncertainty. That said, our first estimates of SST from ~1000CE and 1600CE are consistent with regional cooling during both intervals, with more pronounced cooling inferred during the earlier “Medieval Climate Anomaly”.

*The speaker is a candidate for a faculty position in the Department of Oceanography.


Ticket Information
Free

Event Sponsor
Oceanography, Manoa Campus

More Information
(808) 956-7633

Share by email

Wednesday, May 14
12:00am Cram Jam Spring 2014
Manoa Campus, Campus Center
8:30am Underwater Cultural Heritage: Sayan Praicharnjit
Manoa Campus, Campus Center Ballroom
1:00pm Botany Final Oral
Manoa Campus, St. Johns 11
1:00pm Education Final Oral
Manoa Campus, Wist 131
2:30pm Education Final Oral
Manoa Campus, Wist 234
2:30pm Special Oceanography Seminar
Manoa Campus, Marine Sciences Building, MSB 100
4:30pm NICE International Language Exchange
Manoa Campus, Krauss Hall 012
6:00pm 2014 New Media Arts Demo Reel and Portfolio Show
Kapi'olani Campus, `Ohi`a Cafeteria
6:30pm Talentime (Malaysia)
Manoa Campus, Center for Korean Studies, 1881 East-West Road
7:00pm Stargazing
Windward Campus, Hokulani Imaginarium
previous monthnext monthMay 2014
SMTWTFS
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31
Hints
  • Highlighted dates have scheduled events.
  • Select the date to view all events for that day.