Assessing streamflow sensitivity of forested headwater catchments to disturbance and climate change in the central Appalachian Mountains region, USA

2019 ◽  
Vol 694 ◽  
pp. 133382 ◽  
Author(s):  
David Young ◽  
Nicolas Zégre ◽  
Pamela Edwards ◽  
Rodrigo Fernandez
Keyword(s):  
Climate Change ◽  
Appalachian Mountains ◽  
Headwater Catchments

scholarly journals Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments

2017 ◽  
Vol 3 (2) ◽  
pp. 378-405 ◽  
Author(s):  
J. Fouché ◽  
M. J. Lafrenière ◽  
K. Rutherford ◽  
S. Lamoureux
Keyword(s):  
Climate Change ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Active Layer ◽  
Climate Change Impacts ◽  
High Arctic ◽  
Low Molecular Weight ◽  
Headwater Catchments ◽  
Precipitation Regimes ◽  
Spring Freshet

Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of exported dissolved organic matter (DOM). In July 2007, intense rainfall and active layer thickening caused widespread active layer detachments at Cape Bounty, Melville Island (Canada). This study investigates the impacts of seasonal hydrology and permafrost disturbance on DOM composition exported from High Arctic headwater catchments. In 2012, streams were sampled from three disturbed catchments and one undisturbed catchment. The composition of DOM was characterized using absorbance and fluorescence spectroscopy. DOM was mostly exported during the spring freshet. Throughout this period, the undisturbed catchment exported humified DOM with high humic-like fluorescence that likely originated from runoff through shallow organic rich soil. In contrast, DOM exported from disturbed catchments was fresher, less humified with a high proportion of low molecular weight humic acid. We demonstrate that disturbed catchments delivered likely more labile DOM derived from either thawed permafrost or enhanced microbial activity. If this labile DOM comes from an ancient pool, as indicated by other studies at this site, disturbances may strengthen the permafrost carbon feedback on climate change.

scholarly journals The influence of climate change and canopy disturbances on landslide susceptibility in headwater catchments

2020 ◽  
Vol 742 ◽  
pp. 140588
Author(s):  
Christian Scheidl ◽  
Micha Heiser ◽  
Sebastian Kamper ◽  
Thomas Thaler ◽  
Klaus Klebinder ◽  
...  
Keyword(s):  
Climate Change ◽  
Landslide Susceptibility ◽  
Headwater Catchments

Hydrological controls of DOC export from Nordic headwater catchments. 

2021 ◽  
Author(s):  
Jacqueline Knutson ◽  
François Clayer ◽  
Magnus Norling ◽  
Ahti Lepistö ◽  
Hannu Marttila ◽  
...  
Keyword(s):  
Climate Change ◽  
Surface Waters ◽  
Data Set ◽  
Headwater Catchments ◽  
Lower Elevation ◽  
Hydrologic Controls ◽  
Doc Export ◽  
Doc Concentration ◽  
Long Term Trends ◽  
Source Limitation

<p>Nordic surface waters are currently much browner than during the 1980s due to drivers related to decreased acid deposition, and increased precipitation. While upward trends in concentration of DOC have been well documented, positive trends in the annual export of DOC are not as widespread. The variation in seasonality of DOC export may mask long-term trends in annual export. A large dataset of 30 natural headwater catchments from Finland, Norway, and Sweden contains more than 20 years of discharge and DOC records. We will use these data to better quantify the trends of DOC export and their relationships to seasonality and the effects of climatic changes seen over the last few decades, such as diminished snowpack, less distinct snowmelt events and increases in autumn precipitation. We will investigate both the seasonal and annual relationships between DOC concentration and discharge (C-Q) and test if they relate to time and catchment characteristics such as size, latitude, and landcover.</p><p>We explore 3 hypotheses in this data set. First, spring DOC export is decreased due to less distinct snowmelt and runoff events while autumn export of DOC is increased as a consequence of more autumn runoff. Second, we propose that catchments with a longer or more distinct snow cover period are more sensitive than catchments at lower elevation or latitude due to the length of inactivity caused by low temperatures and a more defined snowmelt runoff event. Third, we hypothesize the negative C-Q relationship in winter and spring is likely due to source limitation and dilution while hydrologic controls in summer and autumn are associated with positive C-Q relationships.</p><p>Climate change is promoting enhanced export of DOC from soils towards surface waters, leading to more carbon processed and transported along the aquatic continuum from headwaters to coast. This data set gives us an opportunity to look at a diverse set of headwater catchments in the Nordic region, an area disproportionally affected by climate change, to clarify the hydrologic components and how this will affect overall carbon transport. </p>

Direct response of small non-glaciated headwater catchments to Late Quaternary climate change: The Valle de la Fueva, southern Pyrenees

Geomorphology ◽  
2018 ◽  
Vol 318 ◽  
pp. 187-202 ◽  
Author(s):  
Kurt Martin Stange ◽  
Ivar Midtkandal ◽  
Johan P. Nystuen ◽  
Hans-Joachim Kuss ◽  
Cornelia Spiegel
Keyword(s):  
Climate Change ◽  
Late Quaternary ◽  
Direct Response ◽  
Headwater Catchments ◽  
Quaternary Climate

scholarly journals Impact of Climate Change on Streamflow Hydrology in Headwater Catchments of the Upper Blue Nile Basin, Ethiopia

Water ◽  
2018 ◽  
Vol 10 (2) ◽  
pp. 120 ◽  
Author(s):  
Abeyou Worqlul ◽  
Yihun Taddele Dile ◽  
Essayas Ayana ◽  
Jaehak Jeong ◽  
Anwar Adem ◽  
...  
Keyword(s):  
Climate Change ◽  
Nile Basin ◽  
Blue Nile ◽  
Headwater Catchments ◽  
Impact Of Climate Change ◽  
Blue Nile Basin ◽  
Upper Blue Nile Basin

Sylvilagus obscurus (Lagomorpha: Leporidae)

2019 ◽  
Vol 51 (984) ◽  
pp. 128-135
Author(s):  
Andrew J Edelman
Keyword(s):  
Climate Change ◽  
Appalachian Mountains ◽  
Black Spot ◽  
Habitat Destruction ◽  
Sylvilagus Floridanus ◽  
Anterior Edge ◽  
Ericaceous Shrubs ◽  
Successional Forests ◽  
Eastern Cottontail ◽  
Near Threatened

Abstract Sylvilagus obscurus Chapman, Cramer, Dippenaar, and Robinson, 1992, commonly called the Appalachian cottontail, is distinguished from other syntopic leporids by its black spot between the ears, black fur along the anterior edge of the ears, and reddish-gray sides overlaid with a black wash. One of 22 species in the genus, S. obscurus is found across the Appalachian Mountains region, from Pennsylvania to northern Alabama. An inhabitant of habitats with dense woody understory cover such as early successional forests and mature forests with ericaceous shrubs, this rabbit is considered “Near Threatened,” with major threats that include habitat destruction, climate change, and competition with the eastern cottontail, Sylvilagus floridanus.

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