Blowing Snow at McMurdo Station, Antarctica during the AWARE Field Campaign: Surface and Ceilometer Observations

2021 ◽  
Author(s):  
Nicole A. Loeb ◽  
Aaron Kennedy
Keyword(s):  
Blowing Snow ◽  
Field Campaign ◽  
Mcmurdo Station

Visually Induced Steering Errors From Simulated Blowing Snow Are Affected by Environmental Objects

2007 ◽  
Author(s):  
Roger Lew ◽  
Brian P. Dyre ◽  
Aaron Powers ◽  
Frank Yarbrough
Keyword(s):  
Blowing Snow ◽  
Environmental Objects

Buffalo Crusaders: The Sacred Struggle for America’s Last Wild and Pure Herd

2017 ◽  
Author(s):  
Justin Farrell
Keyword(s):  
Brucella Abortus ◽  
Direct Action ◽  
Moral Relativism ◽  
Religious Conflict ◽  
Field Campaign ◽  
Activist Group ◽  
Religious Dimensions ◽  
Post Hoc

This chapter examines the bitter, long-lasting, and sometimes violent dispute over the Yellowstone bison herd—America's only remaining genetically pure and free-roaming herd, which once numbered more than 30 million but was exterminated down to a mere 23 single animals. This intractable issue hinges on current scientific disagreements about the biology and ecology of the disease brucellosis (Brucella abortus). But in recent years, a more radical, grassroots, and direct action activist group called the Buffalo Field Campaign (BFC) has found success by shifting the focus of the debate away from science, toward the deeper religious dimensions of the issue. The chapter shows how the infusion of the conflict with moral and spiritual feeling has brought to the fore deeper questions that ultimately needed to be answered, thus making this a public religious conflict as much as a scientific one, sidestepping rabbit holes of intractability. It observes the ways in which BFC activists engaged in a phenomenon called moral and religious “muting.” This has theoretical implications for understanding how certain elements of culture (e.g., individualism and moral relativism) can organize and pattern others—especially in post hoc explanations of religiously motivated activism.

Harvard Bounce Apparatus GoAmazon 2014/15 Field Campaign Report

2016 ◽  
Author(s):  
Adam Bateman ◽  
◽  
Scott T. Martin
Keyword(s):  
Field Campaign

scholarly journals Blowing and drifting snow in Alpine terrain: numerical simulation and related field measurements

1998 ◽  
Vol 26 ◽  
pp. 174-178 ◽  
Author(s):  
Peter Gauer
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Three Dimensional ◽  
Field Measurements ◽  
Blowing Snow ◽  
Related Field ◽  
Drifting Snow ◽  
Physically Based ◽  
Snow Transport

A physically based numerical model of drifting and blowing snow in three-dimensional terrain is developed. The model includes snow transport by saltation and suspension. As an example, a numerical simulation for an Alpine ridge is presented and compared with field measurements.

scholarly journals Modeling microphysical effects of entrainment in clouds observed during EUCAARI-IMPACT field campaign

2013 ◽  
Vol 13 (16) ◽  
pp. 8489-8503 ◽  
Author(s):  
D. Jarecka ◽  
H. Pawlowska ◽  
W. W. Grabowski ◽  
A. A. Wyszogrodzki
Keyword(s):  
Boundary Layer ◽  
Turbulent Mixing ◽  
Marine Boundary Layer ◽  
Cloud Droplet ◽  
Droplet Radius ◽  
Subgrid Scale ◽  
Microphysics Scheme ◽  
Local Conditions ◽  
Field Campaign ◽  
Les Model

Abstract. This paper discusses aircraft observations and large-eddy simulation (LES) modeling of 15 May 2008, North Sea boundary-layer clouds from the EUCAARI-IMPACT field campaign. These clouds are advected from the northeast by the prevailing lower-tropospheric winds and featured stratocumulus-over-cumulus cloud formations. An almost-solid stratocumulus deck in the upper part of the relatively deep, weakly decoupled marine boundary layer overlays a field of small cumuli. The two cloud formations have distinct microphysical characteristics that are in general agreement with numerous past observations of strongly diluted shallow cumuli on one hand and solid marine stratocumulus on the other. Based on the available observations, a LES model setup is developed and applied in simulations using a novel LES model. The model features a double-moment warm-rain bulk microphysics scheme combined with a sophisticated subgrid-scale scheme allowing local prediction of the homogeneity of the subgrid-scale turbulent mixing. The homogeneity depends on the characteristic time scales for the droplet evaporation and for the turbulent homogenization. In the model, these scales are derived locally based on the subgrid-scale turbulent kinetic energy, spatial scale of cloudy filaments, mean cloud droplet radius, and humidity of the cloud-free air entrained into a cloud, all predicted by the LES model. The model reproduces contrasting macrophysical and microphysical characteristics of the cumulus and stratocumulus cloud layers. Simulated subgrid-scale turbulent mixing within the cumulus layer and near the stratocumulus top is on average quite inhomogeneous, but varies significantly depending on the local conditions.

scholarly journals Condensation/immersion mode ice-nucleating particles in a boreal environment

2020 ◽  
Vol 20 (11) ◽  
pp. 6687-6706
Author(s):  
Mikhail Paramonov ◽  
Saskia Drossaart van Dusseldorp ◽  
Ellen Gute ◽  
Jonathan P. D. Abbatt ◽  
Paavo Heikkilä ◽  
...  
Keyword(s):  
Field Campaign ◽  
Particle Species ◽  
Entire Field ◽  
Time Period ◽  
Regional Sources ◽  
Range Transport ◽  
Thermodynamic Conditions ◽  
Set Up ◽  
Boreal Environment ◽  
Measurement Location

Abstract. Ice-nucleating particle (INP) measurements were performed in the boreal environment of southern Finland at the Station for Measuring Ecosystem–Atmosphere Relations (SMEAR II) in the winter–spring of 2018. Measurements with the Portable Ice Nucleation Chamber (PINC) were conducted at 242 K and 105 % relative humidity with respect to water. The median INP number concentration [INP] during a 6-week measurement period was 13 L−1. The [INP] spanned 3 orders of magnitude and showed a general increase from mid-February until early April. No single dominant local or regional sources of INPs in the boreal environment of southern Finland could be identified. Rather, it is hypothesised that the INPs detected at SMEAR II are a result of long-range transport and dilution of INPs sourced far from the measurement site. Despite high variability, the measured [INP] values fall within the range expected for the [INP] measured elsewhere under similar thermodynamic conditions. The [INP] did not correlate with any of the examined parameters during the entire field campaign, indicating that no one single parameter can be used to predict the [INP] at the measurement location during the examined time period. The absence of a correlation across the entire field campaign also suggests that a variety of particles act as INPs at different times, although it was indirectly determined that ambient INPs are most likely within the size range of 0.1–0.5 µm in diameter on average. On shorter timescales, several particle species correlated well with the [INP]. Depending on the meteorological conditions, black carbon (BC), supermicron biological particles and sub-0.1 µm particles, most likely nanoscale biological fragments such as ice-nucleating macromolecules (INMs), correlated with the INP signal. However, an increase in the concentration of any of these particle species may not necessarily lead to the increase in the [INP]; the reasons for this remain unknown. Limitations of the instrumental set-up and the necessity for future field INP studies are addressed.

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