Archives par mot-clé : Ocean

German Scientists Call Recent Sea Level Rise Claims “Fijigate”, …Hyped Up To Generate Money

by Dr. Sebastian Lüning and Prof. Fritz Vahrenholt, November 15, 2017 in  NoTricksZone

After a peak in 2012 the level went down by about 10 cm by mid 2017. It is very much related to natural variations, in sync with the El Ninos (low levels) and La Ninas (high levels).

So what remains of the climate change horror stories in connection to the Fiji Islands? (…)

Oceans driving warming this century, same as in 1930s

by Ron Clutz, November 8, 2017, in ClimateChangeDispatch

The graph [after the jump] is noisy, but the density is needed to see the seasonal patterns in the oceanic fluctuations. Previous posts focused on the rise and fall of the last El Nino starting in 2015.

This post takes a longer view, encompassing the significant 1998 El Nino and since. The color schemes are retained for Global, Tropics, NH and SH anomalies. 

Despite the long time frame, I have kept the monthly data (rather than yearly averages) because of interesting shifts between January and July.


Northern South China Sea SST changes over the last two millennia and possible linkage with solar irradiance

by Deming Kong et al., November 30, 2017 in Quaternary International

High-resolution surface temperature records over the last two millennia are crucial to understanding the forcing and response mechanism of Earth’s climate. Here we report a bidecadal-resolution sea surface temperature (SST) record based on long-chain alkenones in a gravity sediment core retrieved from the northern South China Sea. SST values varied between 26.7 and 27.5 °C, with a total variability ∼1 °C over the last 2000 years.

Oxygen-18 Stability in Foraminifera fossils, implications in paleoclimatology

by Andy May, November 4, 2017

18O is a rare isotope of oxygen. The ratio of 18O to the normal 16O in foraminifera fossils (“forams”) can be used to estimate paleo-ocean temperatures. Higher values mean lower temperatures. A recent article on (here) led me to Bernard, et al., 2017, which has experimental data that suggest 18O concentrations can be altered in fossils by solid-state diffusion after fossilization. This can corrupt the measurement and the resulting calculated temperature

Température des océans: la fiabilité des calculs remise en cause

by Le Vif, 31 octobre 2017

Les scientifiques en déduisent que le réchauffement global actuel pourrait potentiellement être “sans précédent” sur les 100 derniers millions d’années. L’étude de ces géochimistes, publiée dans Nature Communications, constitue une sorte de pavé dans la mare des paléoclimatologues qui utilisent depuis les années 1950 ce “paléothermomètre” aidant à bâtir les modèles actuels sur le réchauffement climatique

The End Of The Ocean Acidification Scare For Corals

by McCulloch et al., 2017, October 2017,  in co2science

Paper Reviewed: McCulloch, M.T., D’Olivo, J.P., Falter, J., Holcomb, M. and Trotter, J.A. 2017. Coral calcification in a changing world and the interactive dynamics of pH and DIC upregulation. Nature Communications 8: 15686, DOI:10.1038/ncomms15686

(…) The implications of the above findings are enormous, for they reveal that “pHcf upregulation occurs largely independent of changes in seawater carbonate chemistry, and hence ocean acidification,” demonstrating “the ability of the coral to ‘control’ what is arguably one of its most fundamental physiological processes, the growth of its skeleton within which it lives.

See also here

The Little Boy, El Nino and Natural Climate Change

by Anastasios Tsonis, September 15, 2017 in GWPF Report26 (.pdf)

This report describes this phenomenon and brings it into a modern global con- text. But the story is more than simply one of some old South American geophysical phenomenology seen from a global perspective; it is tied to an extraordinary story about new scienti c thinking, arising at the end of the 20th century, concerning the nature of change itself.

The onset of widespread marine red beds and the evolution of ferruginous oceans

by Haijun Song et al., August 2017, in Nature

Banded iron formations were a prevalent feature of marine sedimentation ~3.8–1.8 billion years ago and they provide key evidence for ferruginous oceans. The disappearance of banded iron formations at ~1.8 billion years ago was traditionally taken as evidence for the demise of ferruginous oceans, but recent geochemical studies show that ferruginous conditions persisted throughout the later Precambrian, and were even a feature of Phanerozoic ocean anoxic events.