| |
Records |
Links |
|
Author |
Nathalie Boullot, Florence Rabier, Rolf Langland, Ron Gelaro, Carla Cardinali, Vincent Guidard, Peter Bauer, Alexis Doerenbecher |
|
| |
Title |
Observation impact over the southern polar area during the Concordiasi field campaign |
Type |
Journal |
| |
Year |
2016 |
Publication |
Quarterly Journal of the Royal Meteorological Society |
Abbreviated Journal |
|
|
| |
Volume |
142 |
Issue |
695 |
Pages |
597-610 |
|
| |
Keywords |
dropsondes forecast score forecast sensitivity to observations observing-system experiment |
|
| |
Abstract |
|
|
| |
Programme |
914 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1477-870X |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial  |
8281 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
T. Dinh, A. Podglajen, A. Hertzog, B. Legras, R. Plougonven |
|
| |
Title |
Effect of gravity wave temperature fluctuations on homogeneous ice nucleation in the tropical tropopause layer |
Type |
Journal |
| |
Year |
2016 |
Publication |
Atmospheric Chemistry and Physics |
Abbreviated Journal |
|
|
| |
Volume |
16 |
Issue |
1 |
Pages |
35-46 |
|
| |
Keywords |
|
|
| |
Abstract |
The impact of high-frequency fluctuations of temperature on homogeneous nucleation of ice crystals in the vicinity of the tropical tropopause is investigated using a bin microphysics scheme for air parcels. The imposed temperature fluctuations come from measurements during isopycnic balloon flights near the tropical tropopause. The balloons collected data at high frequency, guaranteeing that gravity wave signals are well resolved.
With the observed temperature time series, the numerical simulations with homogeneous freezing show a full range of ice number concentration (INC) as previously observed in the tropical upper troposphere. In particular, a low INC may be obtained if the gravity wave perturbations produce a non-persistent cooling rate (even with large magnitude) such that the absolute change in temperature remains small during nucleation. This result is explained analytically by a dependence of the INC on the absolute drop in temperature (and not on the cooling rate). This work suggests that homogeneous ice nucleation is not necessarily inconsistent with observations of low INCs. |
|
| |
Programme |
914 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1680-7316 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8280 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica |
Type |
Journal |
| |
Year |
2017 |
Publication |
The Cryosphere |
Abbreviated Journal |
|
|
| |
Volume |
11 |
Issue |
5 |
Pages |
2345-2361 |
|
| |
Keywords |
|
|
| |
Abstract |
The Correct Derivation Of Paleotemperatures From Ice Cores Requires Exact Knowledge Of All Processes Involved Before And After The Deposition Of Snow And The Subsequent Formation Of Ice. At The Antarctic Deep Ice Core Drilling Site Dome C, A Unique Data Set Of Daily Precipitation Amount, Type, And Stable Water Isotope Ratios Is Available That Enables Us To Study In Detail Atmospheric Processes That Influence The Stable Water Isotope Ratio Of Precipitation. Meteorological Data From Both Automatic Weather Station And A Mesoscale Atmospheric Model Were Used To Investigate How Different Atmospheric Flow Patterns Determine The Precipitation Parameters. A Classification Of Synoptic Situations That Cause Precipitation At Dome C Was Established And, Together With Back-trajectory Calculations, Was Utilized To Estimate Moisture Source Areas. With The Resulting Source Area Conditions (Wind Speed, Sea Surface Temperature, And Relative Humidity) As Input, The Precipitation Stable Isotopic Composition Was Modeled Using The So-called Mixed Cloud Isotope Model (Mcim). The Model Generally Underestimates The Depletion Of 18o In Precipitation, Which Was Not Improved By Using Condensation Temperature Rather Than Inversion Temperature. Contrary To The Assumption Widely Used In Ice Core Studies, A More Northern Moisture Source Does Not Necessarily Mean Stronger Isotopic Fractionation. This Is Due To The Fact That Snowfall Events At Dome C Are Often Associated With Warm Air Advection Due To Amplification Of Planetary Waves, Which Considerably Increases The Site Temperature And Thus Reduces The Temperature Difference Between Source Area And Deposition Site. In Addition, No Correlation Was Found Between Relative Humidity At The Moisture Source And The Deuterium Excess In Precipitation. The Significant Difference In The Isotopic Signal Of Hoarfrost And Diamond Dust Was Shown To Disappear After Removal Of Seasonality. This Study Confirms The Results Of An Earlier Study Carried Out At Dome Fuji With A Shorter Data Set Using The Same Methods. |
|
| |
Programme |
1149 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1994-0416 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8279 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Thermal strategies of king penguins during prolonged fasting in water |
Type |
Journal |
| |
Year |
2017 |
Publication |
Journal of Experimental Biology |
Abbreviated Journal |
|
|
| |
Volume |
220 |
Issue |
24 |
Pages |
4600-4611 |
|
| |
Keywords |
|
|
| |
Abstract |
Most animals experience periods of unfavourable conditions, challenging their daily energy balance. During breeding, king penguins fast voluntarily for up to 1.5?months in the colony, after which they replenish their energy stores at sea. However, at sea, birds might encounter periods of low foraging profitability, forcing them to draw from previously stored energy (e.g. subcutaneous fat). Accessing peripheral fat stores requires perfusion, increasing heat loss and thermoregulatory costs. Hence, how these birds balance the conflicting demands of nutritional needs and thermoregulation is unclear. We investigated the physiological responses of king penguins to fasting in cold water by: (1) monitoring tissue temperatures, as a proxy of tissue perfusion, at four distinct sites (deep and peripheral); and (2) recording their oxygen consumption rate while birds floated inside a water tank. Despite frequent oscillations, temperatures of all tissues often reached near-normothermic levels, indicating that birds maintained perfusion to peripheral tissues throughout their fasting period in water. The oxygen consumption rate of birds increased with fasting duration in water, while it was also higher when the flank tissue was warmer, indicating greater perfusion. Hence, fasting king penguins in water maintained peripheral perfusion, despite the associated greater heat loss and, therefore, thermoregulatory costs, probably to access subcutaneous fat stores. Hence, the observed normothermia in peripheral tissues of king penguins at sea, upon completion of a foraging bout, is likely explained by their nutritional needs: depositing free fatty acids (FFA) in subcutaneous tissues after profitable foraging or mobilizing FFA to fuel metabolism when foraging success was insufficient. |
|
| |
Programme |
394 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0022-0949 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8278 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Restoration of reindeer lichen pastures after forest fire in northern Sweden: Seven years of results |
Type |
Journal |
| |
Year |
2017 |
Publication |
Ecological Engineering |
Abbreviated Journal |
|
|
| |
Volume |
108 |
Issue |
|
Pages |
143-151 |
|
| |
Keywords |
Artificial dispersal Caribou Prescribed burning Restoration ecology Transplantation |
|
| |
Abstract |
Fire suppression since the 19th century has modified the functioning of boreal forest ecosystems in northern Sweden. In the long run, it induces changes in understory vegetation that result, especially on mesic sites, in feather mosses and Ericaceous dwarf shrubs outcompeting ground lichens, thus decreasing winter pastures for reindeer husbandry. In 2008, a field experiment was established in which, two years after a large forest fire, reindeer lichen (Cladonia spp.) was transplanted across various plots. The general objective was to accelerate the recovery of lichen-rich reindeer pastures, and test the ability of lichen thalli to establish on burnt surfaces following different post-fire treatments (tree harvest and standing trees retained), in different transplantation seasons (summer and winter) and at different doses (0.45Lm?2 and 2.25Lm?2). The abundance and level of occupancy of viable and established lichen fragments was determined in 0.25m2 quadrats in 2010, 2013 and 2015. There was a continuous increase in lichen establishment over time, and seven years after transplantation, established lichen occupied, on average, 55% and 83% of the 0.25m2 quadrats treated with the lower and higher doses, respectively. Nine years after fire, no lichen had colonized the control, i.e. the burnt surface outside the experimental area. At the site with standing trees retained, lichen had already formed a well-established mat with a significantly higher lichen occupancy and abundance than in the open, clear-cut sites, where lichen agglomerated in proto-mats. Lichen transplanted in late-summer exhibited higher abundance and occupancy than that transplanted in late-winter. On average, the difference in lichen occupancy and abundance between different doses after seven years was of lower magnitude than between the doses of lichen transplanted initially. The experiment reveals useful results for the restoration of reindeer pastures and for specifying fire management regimes adapted to both forestry and reindeer husbandry. |
|
| |
Programme |
1127 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0925-8574 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8277 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Mate similarity in foraging Kerguelen shags: a combined bio-logging and stable isotope investigation |
Type |
Journal |
| |
Year |
2017 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
|
|
| |
Volume |
578 |
Issue |
|
Pages |
183-196 |
|
| |
Keywords |
Diet Diving behaviour Kerguelen shags Mate choice Pair similarity Spatial use Stable isotopes |
|
| |
Abstract |
|
|
| |
Programme |
394 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0171-8630, 1616-1599 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8276 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Circulation and water mass transports on the East Antarctic shelf in the Mertz Glacier region |
Type |
Journal |
| |
Year |
2017 |
Publication |
Deep sea research part i: oceanographic research papers |
Abbreviated Journal |
|
|
| |
Volume |
126 |
Issue |
|
Pages |
1-20 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
452 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
0967-0637 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8275 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Locked in the icehouse: Evolution of an endemic Epimeria (Amphipoda, Crustacea) species flock on the Antarctic shelf |
Type |
Journal |
| |
Year |
2017 |
Publication |
Molecular Phylogenetics and Evolution |
Abbreviated Journal |
|
|
| |
Volume |
114 |
Issue |
|
Pages |
14-33 |
|
| |
Keywords |
Amphipoda Divergence times Diversification Historical biogeography Phylogeny Southern ocean |
|
| |
Abstract |
|
|
| |
Programme |
281,1124,1142 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
Bachelor's thesis |
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1055-7903 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8274 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
Anais J. Orsi, Kenji Kawamura, Valerie Masson-Delmotte, Xavier Fettweis, Jason E. Box, Dorthe Dahl-Jensen, Gary D. Clow, Amaelle Landais, Jeffrey P. Severinghaus |
|
| |
Title |
The recent warming trend in North Greenland |
Type |
Journal |
| |
Year |
2017 |
Publication |
Geophysical Research Letters |
Abbreviated Journal |
|
|
| |
Volume |
44 |
Issue |
12 |
Pages |
6235-6243 |
|
| |
Keywords |
borehole temperature Greenland ice sheet surface warming |
|
| |
Abstract |
|
|
| |
Programme |
458 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1944-8007 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8273 |
|
| Permanent link to this record |
| |
|
| |
|
Author |
|
|
| |
Title |
Spatial overlaps of foraging and resting areas of black-legged kittiwakes breeding in the English Channel with existing marine protected areas |
Type |
Journal |
| |
Year |
2017 |
Publication |
Marine Biology |
Abbreviated Journal |
|
|
| |
Volume |
164 |
Issue |
5 |
Pages |
119 |
|
| |
Keywords |
|
|
| |
Abstract |
|
|
| |
Programme |
388 |
|
| |
Campaign |
|
|
| |
Address |
|
|
| |
Corporate Author |
|
Thesis |
|
|
| |
Publisher |
|
Place of Publication |
|
Editor |
|
|
| |
Language |
|
Summary Language |
|
Original Title |
|
|
| |
Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
|
| |
Series Volume |
|
Series Issue |
|
Edition |
|
|
| |
ISSN |
1432-1793 |
ISBN |
|
Medium |
|
|
| |
Area |
|
Expedition |
|
Conference |
|
|
| |
Notes |
|
Approved |
yes |
|
| |
Call Number |
|
Serial |
8272 |
|
| Permanent link to this record |
