impact of southern ice arch for fast ice of
impact of southern ice arch for opening of
- Peshastin, Washington (Wikipedia)
Peshastin is a small unincorporated community in Chelan County, Washington, United States. The community’s roots are found in the “Peshastin Ditch” dug by pioneers beginning in 1889. This ditch was an important part of the overall irrigation system in the area, delivering water to the orchards on the slopes above Cashmere. The town was first platted in the early 1890s by two brothers, J. Q. Gilbert and A. C. Gilbert. It is also noted on an 1895 map of the area, indicating it was in existence by then.
- Holocene sea-ice dynamics in Petermann Fjord in relation to ice tongue stability and Nares Strait ice arch formation (tc.copernicus.org)
The Petermann 2015 expedition to Petermann Fjord and adjacent Hall Basin recovered a transect of cores, extending from Nares Strait to underneath the 48 km long ice tongue of Petermann glacier, offering a unique opportunity to study ice–ocean–sea ice interactions at the interface of these realms. First results suggest that no ice tongue existed in Petermann Fjord for large parts of the Holocene, raising the question of the role of the ocean and the marine cryosphere in the collapse and re-establishment of the ice tongue. Here we use a multi-proxy approach (sea-ice-related biomarkers, total organic carbon and its carbon isotopic composition, and benthic and planktonic foraminiferal abundances) to explore Holocene sea ice dynamics at OD1507-03TC-41GC-03PC in outer Petermann Fjord. Our results are in line with a tight coupling of the marine and terrestrial cryosphere in this region and, in connection with other regional sea ice reconstructions, give insights into the Holocene evolution of ice arches and associated landfast ice in Nares Strait.