Air temperature changes in the Canadian Arctic from the early instrumental period to modern times

2005 ◽  
Vol 25 (11) ◽  
pp. 1507-1522 ◽  
Author(s):  
Rajmund Przybylak ◽  
Zsuzsanna Vizi
Keyword(s):  
Air Temperature ◽  
Canadian Arctic ◽  
Temperature Changes ◽  
Modern Times ◽  
Instrumental Period

Modeling air temperature changes in Northern Asia

2014 ◽  
Vol 122 ◽  
pp. 14-22 ◽  
Author(s):  
A. Onuchin ◽  
M. Korets ◽  
A. Shvidenko ◽  
T. Burenina ◽  
A. Musokhranova
Keyword(s):  
Air Temperature ◽  
Northern Asia ◽  
Temperature Changes

scholarly journals Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles

2012 ◽  
Vol 8 (3) ◽  
pp. 1109-1125 ◽  
Author(s):  
R. Uemura ◽  
V. Masson-Delmotte ◽  
J. Jouzel ◽  
A. Landais ◽  
H. Motoyama ◽  
...  
Keyword(s):  
Air Temperature ◽  
Ice Core ◽  
Ice Cores ◽  
Regression Equations ◽  
Temperature Changes ◽  
Source Temperature ◽  
Moisture Source ◽  
Isotopic Model ◽  
Temperature Proxy ◽  
Coefficient Of Regression

Abstract. A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice core records. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source (Δ Tsource) and at the precipitation site (Δ Tsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve Δ Tsource and Δ Tsite information, different linear regression equations were proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, βsite which is related to the sensitivity of d to Δ Tsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by more than a factor of two. To explore the impacts of this coefficient on reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the βsite coefficient strongly affect (i) the glacial–interglacial magnitude of Δ Tsource; (ii) the imprint of obliquity in Δ Tsource and in the site-source temperature gradient. By contrast, we highlight the robustness of Δ Tsite reconstruction using water isotopes records.

scholarly journals Interdecadal Variations in the Walker Circulation and Its Connection to Inhomogeneous Air Temperature Changes from 1961–2012

Atmosphere ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 469 ◽  
Author(s):  
Xiaoya Hou ◽  
Jianbo Cheng ◽  
Shujuan Hu ◽  
Guolin Feng
Keyword(s):  
Pacific Ocean ◽  
Atmospheric Circulation ◽  
Air Temperature ◽  
Walker Circulation ◽  
Tropical Indian Ocean ◽  
Eastern Pacific ◽  
Eastern Pacific Ocean ◽  
Temperature Changes ◽  
Pattern Decomposition ◽  
Global Atmospheric Circulation

The tropical Pacific Walker circulation (PWC) is fundamentally important to global atmospheric circulation, and changes in it have a vital influence on the weather and climate systems. A novel three-pattern decomposition of a global atmospheric circulation (3P-DGAC) method, which can be used to investigate atmospheric circulations including the PWC, was proposed in our previous study. Therefore, the present study aims to examine the capability of this 3P-DGAC method to acquire interdecadal variations in the PWC and its connection to inhomogeneous air temperature changes in the period from 1961–2012. Our findings reveal that interdecadal variations in the PWC, i.e., weakening (strengthening) between the periods 1961–1974 and 1979–1997 (1979–1997 and 1999–2012), can be observed using the zonal stream function (ZSF) derived from the 3P-DGAC method. Enhancement of the PWC is also associated with the strengthening and weakening of zonal circulations in the tropical Indian Ocean (IOC) and Atlantic (AOC), respectively, and vice versa, implying a connection between these zonal overturning circulations in the tropics. The interdecadal variations in the zonal circulations correspond well to inhomogeneous air temperature changes, i.e., an enhancement of the PWC is associated with a warming (cooling) of the air temperature from 1000 to 300 hPa in the western (mid–eastern) Pacific Ocean and a cooling (warming) of the air temperature in the tropopause in the western (mid–eastern) Pacific Ocean. Furthermore, a novel index for the PWC intensity based on air temperature is defined, and the capability of the novel index in representing the PWC intensity is evaluated. This novel index is potentially important for the prediction of the PWC by using dynamic equations derived from the 3P-DGAC method.

scholarly journals Effect of Temperature on Picloram Absorption and Translocation in Leafy Spurge (Euphorbia esula)

Weed Science ◽  
1990 ◽  
Vol 38 (6) ◽  
pp. 471-474 ◽  
Author(s):  
Rodney G. Lym ◽  
Calvin G. Messersmith
Keyword(s):  
Root System ◽  
Air Temperature ◽  
Leafy Spurge ◽  
Euphorbia Esula ◽  
Effect Of Temperature ◽  
Temperature Changes

Temperature changes prior to picloram application affects its activity in leafy spurge. Absorption of14C picloram was directly correlated with temperature changes; each 1 C increase in air temperature 24 h before treatment resulted in a 1% increase of14C-picloram absorption in leafy spurge and vice versa. The greatest14C-picloram absorption averaged 47% of applied14C when the temperature increased from 18 C to 24 or 30 C 24 h before treatment compared to 33% when temperatures were constant. Translocation of14C picloram was more sensitive than absorption to temperature changes with 4.3 and 1% of applied14C-picloram translocated to the roots when the plants were maintained at 12 and 30 C, respectively. Even though absorption increased directly with temperature,14C-picloram translocation to the root system declined as temperature increased.

scholarly journals Recent air temperature changes in the permafrost landscapes of northeastern Eurasia

Polar Science ◽  
2014 ◽  
Vol 8 (2) ◽  
pp. 114-128 ◽  
Author(s):  
A.N. Fedorov ◽  
R.N. Ivanova ◽  
H. Park ◽  
T. Hiyama ◽  
Y. Iijima
Keyword(s):  
Air Temperature ◽  
Temperature Changes

scholarly journals Long-Term Trends in Air Temperature Distribution and Extremes, Growing Degree‐Days, and Spring and Fall Frosts for Climate Impact Assessments on Agricultural Practices in Nebraska

2012 ◽  
Vol 51 (11) ◽  
pp. 2060-2073 ◽  
Author(s):  
Kari E. Skaggs ◽  
Suat Irmak
Keyword(s):  
Air Temperature ◽  
Central City ◽  
Agricultural Practices ◽  
Growing Season ◽  
Growing Degree Days ◽  
Degree Days ◽  
Temperature Changes ◽  
Growing Season Length ◽  
Average Maximum

AbstractAir temperature influences agricultural practices and production outcomes, making detailed quantifications of temperature changes necessary for potential positive and negative effects on agricultural management practices to be exploited or mitigated. Temperature trends of long-term data for five agricultural locations, ranging from the subhumid eastern to the semiarid western parts of Nebraska, were studied to determine local temperature changes and their potential effects on agricultural practices. The study quantified trends in annual and monthly average maximum and minimum air temperature (Tmax and Tmin), daily temperature range (DTR), total growing degree-days, extreme temperatures, growing‐season dates and lengths, and temperature distributions for five heavily agricultural areas of Nebraska: Alliance, Central City, Culbertson, Fremont, and Hastings. July and August were the months with the greatest decreases in Tmax for the central part of Nebraska—Culbertson, Hastings, and Central City. Alliance, Culbertson, and Fremont had year-round decreases in DTR. Central City and Hastings experienced growing‐season decreases in DTR. Increases in growing‐season length occurred at rates of 14.3, 16.7, and 11.9 days century−1 for Alliance, Central City, and Fremont, respectively. At Hastings, moderately earlier last spring frost (LS) at a rate of 6.6 days century−1 was offset by an earlier (2.7 days century−1) first fall frost (FF), resulting in only a 3.8 days century−1 longer growing season. There were only slight changes in LS and FF dates of around 2 days earlier and 1 day later per century, respectively, for Culbertson.

Air temperature changes in the arctic from 1801 to 1920

2009 ◽  
pp. n/a-n/a ◽  
Author(s):  
Rajmund Przybylak ◽  
Zsuzsanna Vízi ◽  
Przemysław Wyszyński
Keyword(s):  
Air Temperature ◽  
The Arctic ◽  
Temperature Changes

Air temperature changes in Żagań (Poland) in the period from 1781 to 1792

2013 ◽  
Vol 34 (7) ◽  
pp. 2408-2426 ◽  
Author(s):  
R. Przybylak ◽  
A. Pospieszyńska ◽  
P. Wyszyński ◽  
M. Nowakowski
Keyword(s):  
Air Temperature ◽  
Temperature Changes
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