FN Archimer Export Format
PT J
TI A coupled climate model simulation of Marine Isotope Stage 3 stadial climate
BT 
AF BRANDEFELT, J.
   KJELLSTROM, E.
   NASLUND, J. -O.
   STRANDBERG, G.
   VOELKER, A. H. L.
   WOHLFARTH, B.
AS 1:1;2:2;3:3;4:2;5:4;6:5;
FF 1:;2:;3:;4:;5:;6:;
C1 KTH, Dept Mech, Linne Flow Ctr, S-10044 Stockholm, Sweden.
   Swedish Meteorol & Hydrol Inst, S-60176 Norrkoping, Sweden.
   Swedish Nucl Fuel & Waste Management Co SKB, S-10240 Stockholm, Sweden.
   Unidade Geol Marinha, LNEG, P-2610143 Zambujal, Amadora, Portugal.
   Stockholm Univ, Dept Geol Sci, S-10961 Stockholm, Sweden.
C2 KTH, SWEDEN
   SMHI, SWEDEN
   SKB, SWEDEN
   LNEG, PORTUGAL
   UNIV STOCKHOLM, SWEDEN
IN DOAJ
IF 3.509
TC 17
UR https://archimer.ifremer.fr/doc/00228/33898/32218.pdf
LA English
DT Article
CR IMAGES 1-MD101
   IMAGES 3-IPHIS-MD106
   IMAGES 4-MD111
   IMAGES V LEG 1-MD114
   IMAGES V LEG 4-MD114
   MD 122 / WEPAMA
   MD 126 / MONA
   MD 127 / PAGE
   MD 134 / PICABIA
   MD 148 / PECTEN
   MD 155 / MARCO-POLO2
   PACIMA - MD 79
BO Marion Dufresne
AB We present a coupled global climate model (CGCM) simulation, integrated for 1500 yr to quasi-equilibrium, of a stadial (cold period) within Marine Isotope Stage 3 (MIS 3). The simulated Greenland stadial 12 (GS12; similar to 44 ka BP) annual global mean surface temperature (T-s) is 5.5 degrees C lower than in the simulated recent past (RP) climate and 1.3 degrees C higher than in the simulated Last Glacial Maximum (LGM; 21 ka BP) climate. The simulated GS12 is evaluated against proxy data and previous modelling studies of MIS3 stadial climate. We show that the simulated MIS 3 climate, and hence conclusions drawn regarding the dynamics of this climate, is highly model-dependent. The main findings are: (i) Proxy sea surface temperatures (SSTs) are higher than simulated SSTs in the central North Atlantic, in contrast to earlier simulations of MIS 3 stadial climate in which proxy SSTs were found to be lower than simulated SST. (ii) The Atlantic Meridional Overturning Circulation (AMOC) slows down by 50% in the GS12 climate as compared to the RP climate. This slowdown is attained without freshwater forcing in the North Atlantic region, a method used in other studies to force an AMOC shutdown. (iii) El-Nino-Southern Oscillation (ENSO) teleconnections in mean sea level pressure (MSLP) are significantly modified by GS12 and LGM forcing and boundary conditions. (iv) Both the mean state and variability of the simulated GS12 is dependent on the equilibration. The annual global mean T-s only changes by 0.10 degrees C from model years 500-599 to the last century of the simulation, indicating that the climate system may be close to equilibrium already after 500 yr of integration. However, significant regional differences between the last century of the simulation and model years 500-599 exist. Further, the difference between simulated and proxy SST is reduced from model years 500-599 to the last century of the simulation. The results of the ENSO variability analysis is also shown to depend on the equilibration.
PY 2011
SO Climate Of The Past
SN 1814-9324
PU Copernicus Gesellschaft Mbh
VL 7
IS 2
UT 000292247800021
BP 649
EP 670
DI 10.5194/cp-7-649-2011
ID 33898
ER

EF