Evidence from the Pacific Northwest for solar modulation of climate and of northern ecosystems

• Main Author: Holdsworth, Gerald
• Format: Other/Unknown Material
• Language: English
• Published: 1992
• Subjects: Atmospheric Sciences; Earth Sciences; Ecology; PACLIM; Yukon; Pacific; ice core
• Online Access: http://hdl.handle.net/1834/31451

EXTRACT (SEE PDF FOR FULL ABSTRACT):The 250-year net annual snow accumulation, or mass balance, time series derived from the Mt. Logan (Yukon) ice core has been spectrally analyzed and is found to contain a nominal 11-year waveform. The stable isotope time series contains a significant amount of power between 9 and 13 years, although this record is evidently not a straightforward proxy for air temperatures. The signal in the mass balance time series exhibits a close relationship with the sunspot cycle waveform and is, therefore, assumed to be related to it. Waveforms showing a high correlation with the solar cycle are found in other climate data in the region. . Taken collectively, the data point to a link between solar variability, atmospheric variability, climate, and selected ecological dynamics in the Pacific Northwest, but other data, not presented, indicate these relationships may hold elsewhere. So far, the evidence is empirical; complete details of the physical mechanisms involved have yet to be synthesized in a satisfactory way.