Sökning: "Primary production"

Visar resultat 1 - 5 av 915 avhandlingar innehållade orden Primary production.

  1. 1. Primary Marine Aerosol Production : An experimental study based on Arctic Ocean water and a sea water proxy

    Författare :Julia Zábori; Margareta Hansson; Gordon McFiggans; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Arctic Ocean; primary marine aerosol; climate change; sea water physical properties; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : This thesis focuses on the interplay between the physical properties of ocean water and primary marine aerosol (PMA) emissions in the context of a rapidly changing Arctic climate. PMAs are an important part of the climate system due to their ability to interact with incoming solar radiation and to influence cloud properties. LÄS MER

  3. 2. Primary Marine Aerosol Production : Studies using bubble-bursting experiments

    Författare :Kim Hultin; Douglas Nilsson; Radovan Krejci; Ian Cousins; Åke Hagström; Erik Swietlicki; Stockholms universitet; []
    Nyckelord :sea spray; water temperature; dissolved oxygen; photosynthesis; bacterial emissions; V-TDMA; mixing state; eddy covariance; NATURAL SCIENCES; NATURVETENSKAP; Applied Environmental Science; tillämpad miljövetenskap;

    Sammanfattning : Aerosol particles affect the Earth’s climate, although their impact is associated with large uncertainties. Primary marine aerosol represents a significant fraction of the global aerosol budget considering the Earth’s 70-percentage coverage by oceans. LÄS MER

  4. 3. Impacts of global change on primary production in northern lakes

    Författare :Isolde Callisto Puts; Ann-Kristin Bergström; Jenny Ask; Tom H. Andersen; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Primary production; global change; warming; browning; lake; carbon dioxide; organic carbon; inorganic carbon; boreal; arctic; DOC; DIC; CO2; allochthonous organic carbon; benthic; periphyton; environmental change; miljöförändringar; environmental science; miljövetenskap; biology; biologi; climate change; klimatförändringar;

    Sammanfattning : Algae are primary producers, a major component of the aquatic foodweb, and changes in primary production affect aquatic ecology in general. Global changes such as warming, recovery of acidification and changes in land-use have caused warming and browning of northern lakes. LÄS MER

  5. 4. Satellite remote sensing of primary production in semi-arid Africa

    Författare :Martin Sjöström; Institutionen för naturgeografi och ekosystemvetenskap; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; remote sensing; primary production; vegetation index; savanna; grassland;

    Sammanfattning : With the challenges Africa faces with respect to the predicted warming due to climate change, the continents role in the global carbon cycle has been increasingly recognized. Earth observing satellites have played a significant role in the study of vegetation, particularly in Africa where climate stations are sparse. LÄS MER

  7. 5. Primary Aldosteronism Screening and Diagnosis in Primary Health Care

    Författare :Christina Westerdahl; Lund Kirurgi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; hypertension; primary health care; aldosterone; primary aldosteronism; fludrocortisone; aldosterone to renin ratio; renin; captopril;

    Sammanfattning : Arterial hypertension is a very common disorder. In most cases the cause is unknown and therefore classified as essential or primary hypertension. Primary aldosteronism (PA), characterized by an inappropriate aldosterone secretion, has traditionally been estimated to account for approximately 1 % of all hypertensive cases. LÄS MER