Previous Seminars

Comments on the Measurement of Temperature in Fram Strait by Acoustic Tomography

Speaker: 
Brian Dushaw
Affiliation: 
Nansen Senteret and Applied Physics Laboratory/UW/Seattle
Seminar Date: 
24. February 2012 - 12:30 - 13:15

This talk will be a discussion of simulations and practical considerations related to the measurement of temperature within Fram Strait using ocean acoustic tomography. The complementary nature of estimates of average temperature across the Strait by the Fram Strait Mooring Array and tomography will be quantified. The small scale scintillations of sound speed (the mesoscale to internal waves) on acoustic propagation are an important aspect of acoustic propagation of the region.

Champagne and cake will be available following the talk.

Сloudiness in the Arctic: intercomparison of different climatologies and assessment of inter-annual variability

Speaker: 
Alexander Chernokulsky
Affiliation: 
Institute of Atmospheric Physics, Russian Academy of Sciences, Moscow
Seminar Date: 
23. February 2012 - 12:30 - 13:00

The Arctic is a very sensitive region to the global climate change. An increase of air temperature is accompanied with changes in other climate variables; particularly with a decrease of the Arctic sea ice extent and cloud cover changes. The sensitivity of cloud radiative forcing is about 1 Watt per square meter per 1% of cloud cover in the Arctic. Thus, relatively a small percentage of changes in cloud cover or cloud properties could result in an anomalous climate forcing.

What’s going on with primary production in the Arctic during the last years?

Speaker: 
Dmitry Pozdnyakov
Affiliation: 
in cooperation with Dmitry Petrenko and Francois Counillon
Seminar Date: 
16. February 2012 - 12:30 - 13:00

Spaceborne one month averaged data predominantly from SeaWiFs and partly MODIS were used to investigate changes in the primary production (PP) by phytoplankton in the Arctic Ocean from 1998 to 2010. Several PP retrieval algorithms were tested against collected in situ data, and it was shown that the algorithm by Behrenfeld and Falkowski (1997) gave the best results (with the coefficient of correlation, r2 equal to 0.8 and 0.75, respectively, for the pelagic and shelf zones).

The 1960 Perth to Bermuda antipodal acoustic propagation experiment: A measure of a half-century of ocean warming?

Speaker: 
Brian Dushaw
Seminar Date: 
26. January 2012 - 12:30 - 13:00

I am giving this talk again because I will give a shorter version of it
(30 min.) on the 31st at a Symposium, and will need to shorten the
original considerably. I would like to give the shorter version a bit of
practice and be sure I can give it in the allotted time. Plus there
seemed to be some people that missed it the first time and were
interested. This is an informal talk; it will not be on the seminar
schedule.

Air pollution in the BErgen valley

Speaker: 
Tobias Wolf
Seminar Date: 
24. January 2012 - 12:15 - 12:45

Abstract will be added later

Use of radar altimeter waveform data for sea ice classification

Speaker: 
Marta Zygmuntowska
Seminar Date: 
19. January 2012 - 12:30 - 13:00

The talk will give an overview about the ongoing CryoSat mission and show first results for sea ice classification with radar altimeter data.

The ONR – Global organization

Speaker: 
Dr. Ellen Livingston
Affiliation: 
ONR Global, London, UK
Seminar Date: 
18. January 2012 - 10:15 - 10:45

Dr. Ellen Livingston from ONR-Global in London visits Nansen Center 18-19 January 2012, and she will present the ONR-global organization.

In brief ONR global is a link to the international community and offers a few funding mechanisms (not very large budgets) for scientists outside US to foster collaboration. See http://www.onr.navy.mil/en/Science-Technology/ONR-Global/funding-opportu...

Open service network for marine environmental data

Speaker: 
Torill Hamre
Seminar Date: 
12. January 2012 - 12:00 - 13:00

NETMAR aims to develop a pilot European Marine Information System (EUMIS)
for searching, downloading and integrating satellite, in situ and model data
from ocean and coastal areas. EUMIS will use a semantic framework coupled
with ontologies for identifying and accessing distributed data, such as
near-real time, forecast and historical data.

Four pilots have been defined to clarify the needs for satellite, in situ and
model based products and services in selected user communities. The pilots are:
· Pilot 1: Arctic Sea Ice Monitoring and Forecasting

PhD dissertation

Speaker: 
Helene R. Langehaug
Seminar Date: 
9. December 2011 - 1:00 - 23:00

On the predictability of mode-1 internal tides

Speaker: 
Brian Dushaw
Affiliation: 
Applied Physics Laboratory, Seattle
Seminar Date: 
7. December 2011 - 13:00 - 14:00

There will be presented 3 lectures under the covering title "Measuring mode-1 internal tides by ocean acoustic tomography and satellite altimetry: Towards global predictions of the mode-1 internal tide". The lecturer has a 6 month Fulbright fellowship stay at NERSC.

Lecture 3: 13:15-14:00,