ENSO propagation towards the poles.
We present observational evidence of the dynamic linkages between ENSO and Northern Hemisphere (NH) ice conditions over the past 135 years. Using Wavelet Transform (WT) we separate statistically …
Dec 24, 2007Home
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Holocene evolution of Scharffenbergbotnen blue ice area
We show that it is possible to extract a high-resolution (annual) paleoclimate record from the surface of a blue-ice area (BIA). The variability of the surface stable-isotope values suggests that …
Dec 24, 2007 -
Present day summers in Svalbard are as warm as those during the medieval warm period.
Snow pits sampled during two consecutive years (2001, 2002) at the summit of Lomonosovfonna ice cap in central Spitsbergen, Svalbard, showed that ion concentrations were spatially homogeneous. The …
Dec 24, 2007 -
Is there evidence for sunspot forcing of climate at multi-year and decadal periods?
It has been proposed that solar cycle irradiance variations may affect the whole planet’s climate via the stratosphere, the Quasi-Biennial Oscillation (QBO) and Arctic Oscillation (AO). We test this …
Dec 24, 2006 -
My PhD thesis.
Grinsted (2006) Advanced methods of glaciological modelling and time series analysis, Doctoral dissertation, Arctic Centre Reports 47.
Dec 24, 2006 -
SSA enhancement of GPR data.
We present a novel method of improving signal-to-noise ratio in radargrams. The method uses singular spectrum analysis (SSA) to separate each individual radar trace into orthogonal components. The …
Dec 24, 2006 -
Svalbard summer melting, continentality, and sea ice extent from the Lomonosovfonna ice core
We develop a continentality proxy (1600–1930) based on amplitudes of the annual signal in oxygen isotopes in an ice core. We show via modeling that by using 5 and 15 year average amplitudes the …
Dec 24, 2006 -
Influence of large-scale atmospheric circulation on European sea level.
We examine relationships between the variability in the long-term time series of European sea level and the large-scale atmospheric circulation represented by the North Atlantic Oscillation (NAO) and …
Dec 24, 2005 -
Interpreting ancient ice in a shallow ice core from the South Yamato (Antarctica) blue ice area.
We explore methods of dating a 101 m ice core from a bare ice ablation area in the Yamato Mountains, Dronning Maud Land, East Antarctica. There are two unknowns, the age of the ice at the surface and …
Dec 24, 2005 -
New Tools for Analyzing Time Series Relationships and Trends.
Moore, J. C., A. Grinsted, S. Jevrejeva (2005) New Tools for Analyzing Time Series Relationships and Trends. EOS, 86(24). pdf
Dec 24, 2005 -
Separation of melting and environmental signals in an ice core with seasonal melt.
We examine the impact of melt water percolation on the soluble ion chemical record from the Lomonosovfonna ice core. Principle component analysis shows that melting produces only simple changes …
Dec 24, 2005 -
Virtual station reconstruction of global sea level.
We analyze the Permanent Service for Mean Sea Level (PSMSL) database of sea level time series using a method based on Monte Carlo Singular Spectrum Analysis (MC-SSA). We remove 2–30 year …
Dec 24, 2005