Sea ice and methane by Hambler, C, Henderson, PA

“…1) The annual cycle of atmospheric methane in southern high latitudes is extremely highly correlated with Antarctic sea ice extent. 2) The annual cycle of atmospheric methane in the Arctic is highly correlated with Antarctic or Arctic plus Antarctic sea ice extent. 3) We propose the global annual cycle of atmospheric methane is largely driven by Antarctic sea ice dynamics, with relatively stronger influence from other fluxes (probably the biota) in the Northern Hemisphere. 4) We propose degassing during sea ice freeze and temperature dependent solubility in the ocean dominate the annual methane cycle. 5) Results provide evidence that carbon cycle pathways, parameters and predictions must be reassessed.…”

Sea ice and argon by Hambler, C

“…1) Atmospheric argon on Earth and Mars cycles on a seasonal basis and abiotic factors will be particularly important drivers of this noble gas. 2) It is predicted and confirmed that there is similarity in the seasonality of sea ice and argon, with atmospheric argon in a Hemisphere often increasing fastest when sea ice in that Hemisphere is declining fastest. 3) There is some visual similarity between the detailed phenology of Greenland Sea ice extent and argon in some Northern Hemisphere sites, but formal analysis is required. 4) If causal, the mechanism is unclear but could involve argon bubble formation during freezing and bubble release in the spring melt. 5) Other variables with very similar phenology to sea ice, including high-latitude sea temperatures, should be investigated as potential drivers. 6) Cycling of argon by sea ice would strengthen the argument that seasonal cycling of carbon dioxide is in part driven abiotically.…”

Detecting volcanic eruptions in temperature reconstructions by designed break-indicator saturation by Hendry, D, Schneider, L, Smerdon, J

“…We assess the methodology by detecting volcanic eruptions in a time series of Northern Hemisphere mean temperature spanning roughly 1200 years, derived from a fully-coupled global climate model simulation. …”