Sökning: "Arctic Ocean"

Visar resultat 1 - 5 av 42 uppsatser innehållade orden Arctic Ocean.

1. 1. Insights Into Wind Profile Characteristics in the Arctic Marine Boundary Layer

   Master-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

   Författare :Charlotte Sophie Gausa; [2024]
   Nyckelord :Arctic; wind profile power law; MOST; boundary layer; low level jets; sea ice; vindprofil; Arktis; gränsskikt; vindenergi; låghöjdsvindar; havsis;

   Sammanfattning : The atmospheric boundary layer in the Arctic is essential for the understanding of climate change and improving regional weather prediction. The aim of this study is to investigate to which degree wind speed profiles retrieved in the Arctic agree with well known wind profile concepts and understand which local impact factors influence the wind speed profile. LÄS MER

3. 2. Comparative genomics of Central Arctic Ocean microbiota for observation of Alternative Carbon Fixation Pathways

   Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

   Författare :Kaavya Venkateswaran; [2023]
   Nyckelord :comparative genomics; microbial ecology; bioinformatics; carbon fixation; pangenomics;

   Sammanfattning : The Central Arctic Ocean is a repository of rich and diverse biota, whose major portion is one of the most important drivers of global biogeochemical cycles, including carbon cycling. In this study, the functional potential of the microbiota to fix carbon with alternative carbon fixation pathways were investigated along with their chemolithotrophic characteristics. LÄS MER

4. 3. Methane Sulphonic Acid in East Antarctic Coastal Firn and Ice Cores and Its Relationship with Chlorophyll-a and Sea Ice Extent in the Southern Ocean

   Master-uppsats, Uppsala universitet/Institutionen för geovetenskaper

   Författare :Emma Nilsson; [2022]
   Nyckelord :methane sulphonic acid; firn cores; sea ice proxy; marine primary productivity; Fimbul Ice Shelf; Dronning Maud Land; metansulfonsyra; firnkärnor; havsis-proxy; marin primärproduktion; Fimbulisen; Dronning Maud Land;

   Sammanfattning : The seasonal retreat of sea ice in the austral spring and summer around Antarctica has a significant effect on phytoplankton activity, mainly due to light availability, meltwater input of dissolved iron, and surface water stratification. Phytoplankton produce dimethylsulfoniopropionate, the precursor to the climate-cooling gas dimethyl sulphide, which is ventilated to the atmosphere and oxidised to methane sulphonic acid (MSA). LÄS MER

5. 4. Acoustic Doppler Current Profiling for streamflow measurements in subarctic climate

   Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Författare :Linus Nyström; [2022]
   Nyckelord :;

   Sammanfattning : The ADCP (Acoustic Doppler Current Profiling) technology has been widely available and acknowledged as an instrument used for different types of flow measurement since 1990s, from small scale river measurements to larger ocean current mappings. This study was conducted by the author in cooperation with SWECO with the focus on smaller scale measurements especially on small natural watercourses in a sub-arctic climate with the purpose to examine if the ADCP technology can be used as a complement to the more classic methods for this type of flow measurements Current meter and Conductivity flow measurements. LÄS MER

7. 5. Arctic amplification and their relation to regional warming

   Kandidat-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Marianne Olsson; [2022]
   Nyckelord :Arctic; arctic amplification; climate; climate change; global warming; metrics; Earth and Environmental Sciences;

   Sammanfattning : Arctic amplification (AA) is defined as the enhanced warming of the surface temperatures in the Arctic region relative to the globe or Northern Hemisphere (NH) in response to external forcings. It is a prominent feature of the climate system. LÄS MER