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Record #172353:
- #172353
Main publication details
MARC recordHow the isthmus of Panama put ice into the Arctic / Gerald H. Haug, Ralf Tidemann, Lloyd D. Keigwin.
| Title: | How the isthmus of Panama put ice into the Arctic / Gerald H. Haug, Ralf Tidemann, Lloyd D. Keigwin. |
| Author(s): | Haug, Gerald H. Tidemann, Ralf. Keigwin, Lloyd D. |
| Date: | 2004. |
| In: | Oceanus. (2004.), Vol. 42(2) (2004) |
| Abstract: | Examines role of ocean circulation in onset of extensive Northern Hemisphere glaciation 3.1 to 2.7 Myr ago. Contrasts with Antarctic onset 34 Myr ago. Links northern changes to Panama isthmus formation, establishment of Atlantic/Pacific salinity contrast and "ocean conveyor". This initially supplied more carbon dioxide to sub-Arctic Pacific than was taken up by phytoplankton. Resulting atmospheric CO² increase caused Mid Pliocene "greenhouse" warming. Later, moisture carried via Gulf stream to North Atlantic and deposited in Eurasia encouraged sea ice formation on reaching Arctic Ocean. Increased Arctic albedo and blocking of ocean-atmosphere heat exchange encouraged cooling, and flow of warmer less saline Arctic waters into North Atlantic weakened conveyor, discouraging northerly heat transport. Tilting of Earth axis tipped balance in favour of glaciation. Sub-Arctic halocline that was established prevented upwelling, causing further cooling. |
| Notes: | Oceanus. Vol. 42(2) :95-98 (2004). |
| Keywords: | 551.46 -- Oceanography, physical. 551.32 -- Glaciology. 551.58 -- Climatology. 551.583.7 -- Palaeoclimatology. 551.338 -- Ice ages, theories of causation. 551.782.2 -- Pliocene. 551.326 -- Floating ice. 551.465 -- Oceanography, dynamics. 551.463.6 -- Sea water, thermal properties and heat flux. 551.464.5 -- Salinity. 551.465.45 -- Water masses. 551.465.7 -- Oceanography, energy budget. 525.3 -- Earth, orbit and motions. 546.264-31 -- Carbon dioxide. C -- Oceanography, hydrography and hydrology. (*1) -- World. (26) -- Oceans. (*7) -- Antarctic regions. (*60) -- Arctic Ocean and adjacent waters. (*61) -- North Atlantic Ocean. (265) -- Pacific Ocean. |
| SPRI record no.: | 172353 |
LDR 02539naa#a2200000#a#4500 001 SPRI-172353 005 20231203080801.0 007 ta 008 231203s2004####xx#a##|##|###|0||#0|eng#d 035 ## ‡aSPRI-172353 040 ## ‡aUkCU-P‡beng‡eaacr 100 1# ‡aHaug, Gerald H. 245 10 ‡aHow the isthmus of Panama put ice into the Arctic /‡cGerald H. Haug, Ralf Tidemann, Lloyd D. Keigwin. 260 ## ‡a[S.l.] :‡b[s.n.],‡c2004. 300 ## ‡ap. 95-98 :‡bdiags. 500 ## ‡aOceanus. Vol. 42(2) :95-98 (2004). 520 3# ‡aExamines role of ocean circulation in onset of extensive Northern Hemisphere glaciation 3.1 to 2.7 Myr ago. Contrasts with Antarctic onset 34 Myr ago. Links northern changes to Panama isthmus formation, establishment of Atlantic/Pacific salinity contrast and "ocean conveyor". This initially supplied more carbon dioxide to sub-Arctic Pacific than was taken up by phytoplankton. Resulting atmospheric CO² increase caused Mid Pliocene "greenhouse" warming. Later, moisture carried via Gulf stream to North Atlantic and deposited in Eurasia encouraged sea ice formation on reaching Arctic Ocean. Increased Arctic albedo and blocking of ocean-atmosphere heat exchange encouraged cooling, and flow of warmer less saline Arctic waters into North Atlantic weakened conveyor, discouraging northerly heat transport. Tilting of Earth axis tipped balance in favour of glaciation. Sub-Arctic halocline that was established prevented upwelling, causing further cooling. 650 07 ‡a551.46 -- Oceanography, physical.‡2udc 650 07 ‡a551.32 -- Glaciology.‡2udc 650 07 ‡a551.58 -- Climatology.‡2udc 650 07 ‡a551.583.7 -- Palaeoclimatology.‡2udc 650 07 ‡a551.338 -- Ice ages, theories of causation.‡2udc 650 07 ‡a551.782.2 -- Pliocene.‡2udc 650 07 ‡a551.326 -- Floating ice.‡2udc 650 07 ‡a551.465 -- Oceanography, dynamics.‡2udc 650 07 ‡a551.463.6 -- Sea water, thermal properties and heat flux.‡2udc 650 07 ‡a551.464.5 -- Salinity.‡2udc 650 07 ‡a551.465.45 -- Water masses.‡2udc 650 07 ‡a551.465.7 -- Oceanography, energy budget.‡2udc 650 07 ‡a525.3 -- Earth, orbit and motions.‡2udc 650 07 ‡a546.264-31 -- Carbon dioxide.‡2udc 650 07 ‡aC -- Oceanography, hydrography and hydrology.‡2local 651 #7 ‡a(*1) -- World.‡2udc 651 #7 ‡a(26) -- Oceans.‡2udc 651 #7 ‡a(*7) -- Antarctic regions.‡2udc 651 #7 ‡a(*60) -- Arctic Ocean and adjacent waters.‡2udc 651 #7 ‡a(*61) -- North Atlantic Ocean.‡2udc 651 #7 ‡a(265) -- Pacific Ocean.‡2udc 700 1# ‡aTidemann, Ralf. 700 1# ‡aKeigwin, Lloyd D. 773 0# ‡7nnas ‡tOceanus. ‡gVol. 42(2) (2004) ‡wSPRI-90241 916 ## ‡a2005/06/10 -- RF 917 ## ‡aUnenhanced record from Muscat, imported 2019 948 3# ‡a20231203 ‡bRF