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originally posted by: jadedANDcynical
Northern sea ice anomaly:
Yes, a distinct downward trend. There is no denying the sea ice in the northern hemisphere is markedly less than in prior years.
You say the earth has two hemispheres?
Well golly gee, what is happening to sea ice in that other hemisphere?
You mean to say that there appears to be a distinct upward trend? Say it ain't so...
What does that mean for the entire globe then?
Don't tell me...
It's fluctuating within a standard range?
Nah, you've got to be mistaken.
Those charts have to be wrong. Oh, wait, they're from Cryosphere Today? hmmmm...
originally posted by: jadedANDcynical
a reply to: Kali74
Except that sea ice is sea ice, and if sea ice is being lost one place while growing elsewhere the you have roughly the same amount of sea ice you began with.
I'm not saying we aren't harming our planet, in fact I've been pretty vocal about the messes we've made. I just don't think my suv is doing the same amount of damage that BP, Exxon, and TEPCO have and contnue to do.
originally posted by: xuenchen
Al Gore said the ice cap would be long gone by now.
Some of the models suggest to Dr. Maslowski that there is a 75% chance that the entire north polar ice cap during summer... during some of the summer months could be completely ice free within the next 5 to 7 years. Bob used a figure of 2030, and the volumetric analysis leads this... Dr. Maslowski to make that projection.
Except they are in opposite parts of the world, having different affects on different climate systems. It's not simply a matter of sea ice being sea ice.
Sea ice differs between the Arctic and Antarctic, primarily because of their different geography. The Arctic is a semi-enclosed ocean, almost completely surrounded by land. As a result, the sea ice that forms in the Arctic is not as mobile as sea ice in the Antarctic. Although sea ice moves around the Arctic basin, it tends to stay in the cold Arctic waters. Floes are more prone to converge, or bump into each other, and pile up into thick ridges. These converging floes makes Arctic ice thicker. The presence of ridge ice and its longer life cycle leads to ice that stays frozen longer during the summer melt. So some Arctic sea ice remains through the summer and continues to grow the following autumn. Of the 15 million square kilometers (5.8 million square miles) of sea ice that exist during winter, on average, 7 million square kilometers (2.7 million square miles) remain at the end of the summer melt season.
You are of course correct that you driving your SUV isn't damaging the planet as much as a big oil companies. But you are buying their product and in greater quantity because of the vehicle you chose. Just sayin.
This study focuses on the present-day surface elevation of the Greenland and Antarctic ice sheets. Based on 3 years of CryoSat-2 data acquisition we derived new elevation models (DEMs) as well as elevation change maps and volume change estimates for both ice sheets. Here we present the new DEMs and their corresponding error maps. The accuracy of the derived DEMs for Greenland and Antarctica is similar to those of previous DEMs obtained by satellite-based laser and radar altimeters. Comparisons with ICESat data show that 80% of the CryoSat-2 DEMs have an uncertainty of less than 3 m ± 15 m. The surface elevation change rates between January 2011 and January 2014 are presented for both ice sheets. We compared our results to elevation change rates obtained from ICESat data covering the time period from 2003 to 2009. The comparison reveals that in West Antarctica the volume loss has increased by a factor of 3. It also shows an anomalous thickening in Dronning Maud Land, East Antarctica which represents a known large-scale accumulation event. This anomaly partly compensates for the observed increased volume loss of the Antarctic Peninsula and West Antarctica. For Greenland we find a volume loss increased by a factor of 2.5 compared to the ICESat period with large negative elevation changes concentrated at the west and southeast coasts. The combined volume change of Greenland and Antarctica for the observation period is estimated to be −503 ± 107 km3 yr−1. Greenland contributes nearly 75% to the total volume change with −375 ± 24 km3 yr−1.
In contrast to Arctic sea ice, sea ice surrounding Antarctica has expanded1, with record extent2 in 2010. This ice expansion has previously been attributed to dynamical atmospheric changes that induce atmospheric cooling3. Here we show that accelerated basal melting of Antarctic ice shelves is likely to have contributed significantly to sea-ice expansion. Specifically, we present observations indicating that melt water from Antarctica’s ice shelves accumulates in a cool and fresh surface layer that shields the surface ocean from the warmer deeper waters that are melting the ice shelves.
The abyssal warming produces a 0.053 (±0.017) mm yr−1 increase in global average sea level and the deep warming south of the Subantarctic Front adds another 0.093 (±0.081) mm yr−1. Thus, warming in these regions, ventilated primarily by Antarctic Bottom Water, accounts for a statistically significant fraction of the present global energy and sea level budgets.
The warming of the deep ocean is contributing to global and local heat and SLR budgets and needs to be considered for accurate assessments of the roles of the ocean in climate change.