Monthly Archives: May 2006

Climate indicators, Cryosphere

Antarctic Peninsula warmer in mid-Holocene

11 Comments

Some interesting papers from an AGU conference.
“Mid Holocene Warmth in the Antarctic Peninsula: evidence from the Vega Drift”. So, 4000 to 7000 years ago this area was warmer than now.

Jumbo piston core NBP0003-38, a 20.53 meter core from the Vega Drift (Erebus and Terror Gulf, northeastern Antarctic Peninsula), contains a high resolution record of climate extending back ~8500 years. Lithologic and foraminiferal data presented previously document mid-Holocene conditions warmer than today. These data include increased clay concentration, higher concentrations of ice-rafted debris, and higher magnetic susceptibility below ~6000 ybp, the consequence of extensive meltwater and iceberg calving. This change in lithology is accompanied by the presence of a benthic foraminferal assemblage characteristic of the western Antarctic Peninsula, as contrasted to a lower productivity assemblage observed in the upper section of core. New diatom data confirm mid-Holocene warmth, as based on analysis of the distribution of the two varieties of the species Eucampia antarctica. They are distinguished by their symmetry, with the asymmetric E. antarctica var. antarctica characteristic of subpolar waters and the symmetric E. antarctica var. recta a polar form. Increased relative abundance of the sub-polar form occurs between ~4000-7000 ybp, overlapping and then post-dating the time interval characterized by increased ice melt. In addition, the ratio of terminal to intercalary valves was analyzed. A direct consequence of chain length, a function of the amount of growth, this ratio has been used to record oscillations in winter sea ice cover. Data from JPC38 show longest chain lengths (and least winter sea ice) from ~4000-7000 ybp, in concert with the dominance of the sub-polar form of the species. These data suggest the possibility that mid-Holocene warmth at this site was associated with the southward migration of sub-polar waters and consequently less winter sea ice.

So much for all the years of the British Antarctic Survey beating up warming trends from station data there.

The cute-n-tiny.com levitra 10 mg penis gets filled with blood when the penis erection. If you are in an abusive relationship to protective residence or counsel with an abuse agency…back and forth, lowest prices for sildenafil over and over again. In the leisure and entertainment segment, companies such as Disney, Warner, HBO, and others have demonstrated such consistent viagra pill for woman capabilities in theater, television, music, toys, electronic games, and more. Then the use of hearing aid may help in alleviating this ringing levitra properien cute-n-tiny.com of ears sound. Another interesting paper mentions an active undersea volcano in the area. “A Benthic Invertebrate Survey of Jun Jaegyu Volcano: An active undersea volcano in Antarctic Sound, Antarctica”.

Jun Jaegyu volcano, an Antarctic submarine volcano, was dredged in May 2004 during cruise 04-04 of the RV Laurence M. Gould to determine rock, sediment composition and marine macroinvertebrate diversity. The objectives of this study are to examine the benthic assemblages and biodiversity present on a young volcano. The volcano is located on the continental shelf of the northeastern Antarctic Peninsula, where recent changes in surface temperature and ice shelf stability have been observed. This volcano was originally swath-mapped during cruise 01-07 of the Research Vessel-Ice Breaker Nathaniel B. Palmer. During LMG04-04 we also studied the volcano using a SCUD video camera, and performed temperature surveys along the flanks and crest. Both the video and the dredge indicate a seafloor surface heavily colonized by benthic organisms. Indications of fairly recent lava flows are given by the absence of marine life on regions of the volcano.

Jun Jaegyu volcano

We are looking for more data.

Cryosphere, IPCC, Jones et al, Surface Record

Svalbard inhomogenous temperature data

Leave a comment

The Norwegian island of Svalbard, (previously Spitzbergen) has been the locus of some abnormal warm monthly temperatures of late. See recent post on RealClimate by Drs Michael Mann and Phil Jones.

In mid 2000 I commented on the inhomogenous warm trend in Isfjord Radio data. There are comparisons with nearest neighbours, comments on the Jones et al 1986 station intercomparisons and even some comments by Dr Jones.

In conclusion I wrote:

On the basis of the Andenes and TromsØ differences, the wild variations and erratic warm drift in homogeneity between these stations should have been reason for Isfjord Radio to be rejected. No notes or reference to retaining Isfjord Radio as some special case, are to be found in Jones et al 1991 and its retention in the database represents a touching faith in geostatistics outliers.

Looking at the idea that ice melting could be the reason for the rapid warming in Spitzbegen 1912-1923, consider the global map of Jones 1994 temperature anomalies 1901-1996 in Karl 1998 and we see the the Svalbard (Spitzbergen) grid box warms at about 4 degrees, twice that of any other grid box on the planet.

If this rapid warming was due to ice melting, common sense tells us it must have happened somewhere else. A huge magnitude rapid warming such as this could not just occur in a 5 degree grid box. Look at the high northern latitudes on the Karl 1998 map and there are no other comparable examples despite a good scattering of stations above the Arctic Circle.

This case is a manifestation of the lapse in critical standards in climatology, which is after all a very new and ( up to the advent of the IPCC ), very small science.

Just to end up with an example from the real world of mineral exploration known well to the writer. Geochemical and geophysical data which are the mainstay of the orebody discovery process are littered with outlier values that if targeted with drilling would rapidly bankrupt any mineral exploration company. Exploration geologists every day have to deal with filtering out spurious signals from their geostatistics so that scarce exploration funding is not wasted.

In the current world of climatology, large amounts of greenhouse industry controlled taxpayer funded research grants will inevitably dull essential scientific scepticism.