scholarly journals Atmospheric Sampling on Ascension Island Using Multirotor UAVs

Sensors ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 1189 ◽  
Author(s):  
Colin Greatwood ◽  
Thomas Richardson ◽  
Jim Freer ◽  
Rick Thomas ◽  
A. MacKenzie ◽  
...  
Keyword(s):  
Ascension Island ◽  
Atmospheric Sampling

scholarly journals Assessing recent measurement techniques for quantifying black carbon concentration in snow

2012 ◽  
Vol 5 (3) ◽  
pp. 3771-3795 ◽  
Author(s):  
J. P. Schwarz ◽  
S. J. Doherty ◽  
F. Li ◽  
S. T. Ruggiero ◽  
C. E. Tanner ◽  
...  
Keyword(s):  
Black Carbon ◽  
Single Particle ◽  
Carbon Concentration ◽  
Mass Concentration ◽  
Measurement Techniques ◽  
Integrating Sphere ◽  
Recent Measurement ◽  
Atmospheric Sampling ◽  
Careful Assessment ◽  
Snow Samples

Abstract. We evaluate the performance of the Single Particle Soot Photometer (SP2) and the Integrating Sphere/Integrating Sandwich Spectrophotometer (ISSW) in quantifying the concentration of refractory black carbon (BC) in snow samples. We find that the SP2 can be used to measure BC mass concentration in snow with substantially larger uncertainty (60%) than for atmospheric sampling (<30%). Achieving this level of accuracy requires careful assessment of nebulizer performance and SP2 calibration with consideration of the fact that BC in snow tends to larger sizes than typically observed in the atmosphere. Once these issues are addressed, the SP2 is able to measure the size distribution and mass concentration of BC in the snow. Laboratory comparison of the SP2 and the Integrating Sphere/Integrating Sandwich Spectrophotometer (ISSW) revealed significant biases in the estimate of BC concentration from the ISSW when test samples contained dust or non-absorbing particulates. These results suggest that current estimates of BC mass concentration in snow and ice using either the SP2 or the ISSW may be associated with significant underestimates of uncertainty.

Calibration of a cyclone separator for atmospheric sampling

1987 ◽  
Vol 65 ◽  
pp. 261-266 ◽  
Author(s):  
Seshasayi Dharmavaram ◽  
Philip K. Hopke
Keyword(s):  
Cyclone Separator ◽  
Atmospheric Sampling

Recent Bairdiidae (Ostracoda) From Ascension Island

Crustaceana ◽  
1975 ◽  
Vol 28 (1) ◽  
pp. 53-65 ◽  
Author(s):  
Rosalie F. Maddocks
Keyword(s):  
Ascension Island

scholarly journals Classification of Ascension Island and Natal ozonesondes using self-organizing maps

2012 ◽  
Vol 117 (D4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Anders A. Jensen ◽  
Anne M. Thompson ◽  
F. J. Schmidlin
Keyword(s):  
Self Organizing Maps ◽  
Ascension Island ◽  
Self Organizing

Angusticopula rowlingiana, a new melosiroid diatom (Bacillariophyta) from Ascension Island (South Atlantic Ocean)

Phytotaxa ◽  
2019 ◽  
Vol 388 (2) ◽  
pp. 155 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
SANDRA WILFERT ◽  
VACLAV HOUK ◽  
DAVID M. JOHN
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Atlantic Ocean ◽  
Diatom Species ◽  
Ascension Island ◽  
Remote Island ◽  
A New Species ◽  
Similar Combination ◽  
Southern Atlantic Ocean ◽  
Scanning Electron

During a diatom survey of some samples from Ascension Island, a remote island located in the southern Atlantic Ocean, an unknown melosiroid diatom species was studied using both light and scanning electron microscopy. It proved to be a new species described as Angusticopula rowlingiana sp. nov. and characterized by a large number of narrow copulae in the girdle, a marginal ring of small granules, very small pores covering the entire valve face and occasionally having internal valves.                The new species is compared with all Angusticopula species known worldwide and with several Melosira species showing a similar combination of characters. Short notes on its ecology are included.

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