scholarly journals Response to comment on 'Impacts of aeolian dust deposition on phytoplankton dynamics in Queensland coastal waters'

2010 ◽  
Vol 61 (4) ◽  
pp. 504 ◽  
Author(s):  
Emily C. Shaw ◽  
Albert J. Gabric ◽  
Grant H. McTainsh
Keyword(s):  
Coastal Waters ◽  
Phytoplankton Dynamics ◽  
Dust Deposition ◽  
Aeolian Dust

Comment on 'Impacts of aeolian dust deposition on phytoplankton dynamics in Queensland coastal waters' by Shaw et al. (2008)

2010 ◽  
Vol 61 (4) ◽  
pp. 502 ◽  
Author(s):  
Doug Mackie
Keyword(s):  
Causative Agent ◽  
Coastal Waters ◽  
Dust Storm ◽  
Phytoplankton Dynamics ◽  
Dust Deposition ◽  
Aeolian Dust

The central premise of the paper by Shaw et al. (2008) (hereafter SGM) is that phytoplankton in coastal waters of Queensland, Australia, were nutrient-limited and that biomass increased immediately following a large dust storm in October 2002. I will show that (i) the timing of the phytoplankton response precludes the dust storm as a causative agent for chlorophyll increases and (ii) it is not clear that there was actually any change in chlorophyll in response to the dust storm.

Impacts of aeolian dust deposition on phytoplankton dynamics in Queensland coastal waters

2008 ◽  
Vol 59 (11) ◽  
pp. 951 ◽  
Author(s):  
Emily C. Shaw ◽  
Albert J. Gabric ◽  
Grant H. McTainsh
Keyword(s):  
Coastal Waters ◽  
Standing Stock ◽  
Nutrient Budget ◽  
Dust Storms ◽  
Dust Deposition ◽  
Transport Modelling ◽  
Dust Transport ◽  
Aeolian Dust ◽  
Modelling Analysis

Aeolian dust deposition has been shown to stimulate phytoplankton growth in various oligotrophic oceanic regions of the northern hemisphere. The present study investigated the relationship between the change in phytoplankton biomass in Queensland coastal waters and aeolian dust deposition during the severe October 2002 dust storm, using satellite-derived chlorophyll concentrations. A response in phytoplankton standing stock immediately following dust deposition from this event was found in the area of maximal dust deposition, as defined by a previous dust transport modelling analysis. Standing stock levels increased to 1.5–2 times the long-term mean. This is the first documented episode of a dust fertilisation event in Australian coastal waters and, given the high frequency of dust storms in northern Australia, demonstrates that aeolian delivery of nutrients may be an important factor in future regional nutrient budget analyses.

Aeolian dust deposition rates in Northern French forests and inputs to their biogeochemical cycles

2013 ◽  
Vol 80 ◽  
pp. 281-289 ◽  
Author(s):  
Émeline Lequy ◽  
Arnaud Legout ◽  
Sébastien Conil ◽  
Marie-Pierre Turpault
Keyword(s):  
Biogeochemical Cycles ◽  
Dust Deposition ◽  
Deposition Rates ◽  
Aeolian Dust

Dynamics on the Interaction between Vegetation Growth and Aeolian Dust Deposition

2011 ◽  
Vol 356-360 ◽  
pp. 2430-2433 ◽  
Author(s):  
Fei Fan Zhang ◽  
Hua Yong Zhang ◽  
Tou Sheng Huang
Keyword(s):  
Theoretical Basis ◽  
Equilibrium Distribution ◽  
Simulation Analysis ◽  
Critical Curve ◽  
The Other ◽  
Dust Deposition ◽  
Vegetation Growth ◽  
Aeolian Dust ◽  
Interior Equilibrium ◽  
The Stability

From the holistic perspective, a new dynamic model is proposed in this research to investigate the interaction between vegetation growth and aeolian dust deposition. Three cases of equilibrium distribution can be obtained and the stability of interior equilibriums is determined. When there is a stable interior equilibrium, a critical curve exists and separates the coexistent area where vegetation can survive in the environment of aeolian dust deposition, from the other area where vegetation is to be excluded. Simulation analysis further reveals the variation of the critical curve with the parameters and the anthropic influences. The critical curve and the coexistent equilibrium described by the model may be used as a theoretical basis to evaluate the feasibility of vegetation restoration in the environment of aeolian dust deposition.

scholarly journals A 37,000-year environmental magnetic record of aeolian dust deposition from Burial Lake, Arctic Alaska

2015 ◽  
Vol 128 ◽  
pp. 81-97 ◽  
Author(s):  
J.M. Dorfman ◽  
J.S. Stoner ◽  
M.S. Finkenbinder ◽  
M.B. Abbott ◽  
C. Xuan ◽  
...  
Keyword(s):  
Dust Deposition ◽  
Aeolian Dust ◽  
Arctic Alaska ◽  
Magnetic Record

scholarly journals Sensitivity simulations with direct shortwave radiative forcing by aeolian dust during glacial cycles

2014 ◽  
Vol 10 (4) ◽  
pp. 1333-1348 ◽  
Author(s):  
E. Bauer ◽  
A. Ganopolski
Keyword(s):  
Radiative Forcing ◽  
Absorption Efficiency ◽  
Physical Parameters ◽  
Optical Parameters ◽  
Strong Nonlinearity ◽  
Earth System ◽  
Dust Deposition ◽  
Glacial Cycles ◽  
Detailed Model ◽  
Aeolian Dust

Abstract. Possible feedback effects between aeolian dust, climate and ice sheets are studied for the first time with an Earth system model of intermediate complexity over the late Pleistocene period. Correlations between climate and dust deposition records suggest that aeolian dust potentially plays an important role for the evolution of glacial cycles. Here climatic effects from the dust direct radiative forcing (DRF) caused by absorption and scattering of solar radiation are investigated. Key elements controlling the dust DRF are the atmospheric dust distribution and the absorption-scattering efficiency of dust aerosols. Effective physical parameters in the description of these elements are varied within uncertainty ranges known from available data and detailed model studies. Although the parameters can be reasonably constrained, the simulated dust DRF spans a~wide uncertainty range related to the strong nonlinearity of the Earth system. In our simulations, the dust DRF is highly localized. Medium-range parameters result in negative DRF of several watts per square metre in regions close to major dust sources and negligible values elsewhere. In the case of high absorption efficiency, the local dust DRF can reach positive values and the global mean DRF can be insignificantly small. In the case of low absorption efficiency, the dust DRF can produce a significant global cooling in glacial periods, which leads to a doubling of the maximum glacial ice volume relative to the case with small dust DRF. DRF-induced temperature and precipitation changes can either be attenuated or amplified through a feedback loop involving the dust cycle. The sensitivity experiments suggest that depending on dust optical parameters, dust DRF has the potential to either damp or reinforce glacial–interglacial climate changes.

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