Understanding Northern Latitude Vegetation Greening and Browning

2019 ◽  
Author(s):  
◽  
◽  
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Keyword(s):  
Northern Latitude

Influence of Size at Stocking on Survival of Saugeye in a Northern-Latitude Impoundment

1996 ◽  
Vol 11 (4) ◽  
pp. 447-450 ◽  
Author(s):  
Kevin L. Pope ◽  
Mark K. Flammang ◽  
David W. Willis
Keyword(s):  
Northern Latitude

scholarly journals Development of CarbonTracker Europe-CH<sub>4</sub> – Part 2: global methane emission estimates and their evaluation for 2000–2012

2016 ◽  
Author(s):  
Aki Tsuruta ◽  
Tuula Aalto ◽  
Leif Backman ◽  
Janne Hakkarainen ◽  
Ingrid T. van der Laan-Luijkx ◽  
...  
Keyword(s):  
North American ◽  
Transport Model ◽  
Vertical Mixing ◽  
Total Carbon ◽  
In Situ Observation ◽  
Convection Scheme ◽  
Temperate Region ◽  
Northern Latitude ◽  
The North

Abstract. Gobal methane emissions were estimated for 2000–2012 using the CarbonTracker Europe-CH4 (CTE-CH4) data assimilation system. In CTE-CH4, the anthropogenic and biosphere emissions of CH4 are simultaneously constrained by global atmospheric in-situ methane mole fraction observations. We use three configurations developed in Tsuruta et al. (2016) to assess the sensitivity of the CH4 flux estimates to (a) the number of unknown flux scaling factors to be optimized which in turn depends on the choice of underlying land-ecosystem map, and (b) on the parametrization of vertical mixing in the 30 atmospheric transport model TM5. The posterior emission estimates were evaluated by comparing simulations to surface in-situ observation sites, to profile observations made by aircraft, to dry air total column-averaged mole fractions (XCH4) observations from the Total Carbon Column Observing Network (TCCON), and to XCH4 retrievals from the Greenhouse gases Observing SATellite (GOSAT). Our estimated posterior mean global total emissions during 2000–2012 are 516 ± 51 Tg CH4 yr−1, and emission estimates during 2007–2012 are 18 Tg CH4 yr−1 greater than those from 2001–2006, mainly driven by an 35 increase in emissions from the south America temperate region, the Asia temperate region and Asia tropics. The sensitivity of the flux estimates to the underlying ecosystem map was large for the Asia temperate region and Australia, but not significant in the northern latitude regions, i.e. the north American boreal region, the north American temperate region and Europe. Instead, the posterior estimates for the northern latitude regions show larger sensitivity to the choice of convection scheme in TM5. The Gregory et al. (2000) mixing scheme with faster interhemispheric exchange leads to higher estimated CH4 emissions at northern latitudes, and lower emissions in southern latitudes, compared to the estimates using Tiedtke (1989) convection scheme. Our evaluation with non-assimilated observations showed that posterior mole fractions were better matched with the 5 observations when Gregory et al. (2000) convection scheme was used.

Adaptation of Johnsongrass

Weed Science ◽  
1974 ◽  
Vol 22 (1) ◽  
pp. 59-63 ◽  
Author(s):  
Gordon W. Burt
Keyword(s):  
United States ◽  
The United States ◽  
Sorghum Halepense ◽  
Floral Initiation ◽  
Stem Number ◽  
Southern Latitude ◽  
Northern Latitude ◽  
Time Required

Twelve different johnsongrass (Sorghum halepense L.) clones were selected from four different regions of the United States and were grown in the greenhouse. The johnsongrass clones grew differently depending upon the environment from which they were originally obtained, suggesting that geographical ecotypes of johnsongrass exist. The parameter of growth most closely correlated to the latitude from which the plants were obtained was the time required for floral initiation. Plants from a more northern latitude consistently flowered earlier than plants obtained from a more southern latitude. Differences in height, stem number, and the weight of rhizomes, shoots, and roots also supported the hypotheses that geographical ecotypes of johnsongrass exist. Susceptibility to dalapon (2,2-dichloropropionic acid) appeared not to be correlated to the latitude from which the plants were obtained.

Douglas-Fir from New Mexico More Outstanding than Other Sources Studied in Maryland

1989 ◽  
Vol 6 (2) ◽  
pp. 56-59
Author(s):  
John B. Genys
Keyword(s):  
New Mexico ◽  
Douglas Fir ◽  
Seed Source ◽  
Appalachian Region ◽  
Northern Latitude ◽  
Seed Sources ◽  
Christmas Trees ◽  
Natural Range

Abstract Douglas-fir, represented by different seed sources from its natural range, has been studied in two research plantations in Maryland. In the Piedmont Plateau, 24 populations at age 5 varied in foliage turning brown (0% to 22%) which was associated with the longitude (r = 0.61) and the altitude (r = -0.48) of the seed source. At age 12 they varied in survival (6% to 94%), in height (0.9 m to 1.9 m), and in attraction for use as Christmas trees (0% to 19%), all inversely correlated with the northern latitude. In the Appalachian region, 20 sources at age 19 varied in survival (13% to 81%) and in height (1.5 m to 4.2 m), which was inversely correlated to the western longitude, and directly correlated with the altitude of the seed source. In both plantations, the most outstanding populations in survival, height, and attraction for use as Christmas trees were the two sources from Otero County, NM. North. J. Appl. For. 6:56-59, June 1989.

First report of Wohlfahrtiimonas chitiniclastica from soft tissue and bone infection at an unusually high northern latitude

2014 ◽  
Vol 60 (2) ◽  
pp. 155-158 ◽  
Author(s):  
Siiri Kõljalg ◽  
Kaidi Telling ◽  
Kristi Huik ◽  
Marko Murruste ◽  
Virve Saarevet ◽  
...  
Keyword(s):  
Soft Tissue ◽  
Bone Infection ◽  
High Northern Latitude ◽  
First Report ◽  
Northern Latitude
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