Correction to “Aerosol and trace‐gas measurements in the Darwin area during the wet season”

Allen, Grant; Vaughan, G.; Bower, Keith; Crosier, Jonathan; Flynn, Michael J.; Connolly, Paul; Hamilton, Jacqueline F.; Lee, James; Saxton, Julie; Watson, N.; Gallagher, Martin; Coe, Hugh; Allan, J. D.; Lewis, Alastair C.

doi:10.1029/2008jd011284

Cited by 6 publications

(4 citation statements)

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“…6). This is mostly due to the dominating presence of C4 grasses in the understory that are primarily active in the wet season (Andrew and Mott, 1983;Whitley et al, 2011). Despite this, understory GPP did not fully cease in the dry season.…”

Section: Gross Primary Productivitymentioning

confidence: 95%

“…The understory is comprised mainly of C4 grasses, the bulk biomass consisting of the annual Sorghum intrans, with a smaller abundance of the perennial Heteropogon triticeous and S. plumosum. S. intrans grow 1-3 m in height, depending on light availability, and consists of a single stem (Lazarides et al, 1991;Spangler, 2003), which sets seed in the last few weeks of March each year and persists as a transient seed bank throughout the dry season (Andrew and Mott, 1983). After seeding, the adult plant senesces and cures to form a highly flammable fuel load (i.e.…”

Section: Site Descriptionmentioning

confidence: 99%

“…Alternatively, deciduous plants adopt a phenological strategy where they remain dormant through times of water stress as a drought avoidance tactic (Eamus and Prichard, 1998;Eamus, 1999). Grass species typically opt for an annual or perennial phenology as a similar tactic to avoid drought (Andrew and Mott, 1983;Prior et al, 2006;Bond, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Yet diffuse radiation is known to penetrate the tree canopy more than direct radiation (Roderick et al, 2001), which should be beneficial to productivity. However, high variability in cloud cover and atmospheric aerosols in the wet and dry season changes the portion of direct and diffuse radiation reaching the land surface (Allen et al, 2008;Kanniah et al, 2013), which has a direct influence on available solar radiation to support productivity. A modelling study from Whitley et al (2011) suggests savanna productivity can be light limited due to a finite capacity of the vegetation to intercept light given limited canopy cover development.…”

Section: Introductionmentioning

confidence: 99%

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The contribution of trees and grasses to productivity of an Australian tropical savanna

Moore¹,

Beringer²,

Evans³

et al. 2015

Preprint

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Abstract. Savanna ecosystems cover 20 % of the global land surface and account for 25 % of global terrestrial carbon uptake. They support one fifth of the world's human population and are one of the most important ecosystems on our planet. Savanna productivity is a product of the interplay between trees and grass that co-dominate savanna landscapes and are maintained through interactions with climate and disturbance (fire, land use change, herbivory). In this study, we evaluate the temporally dynamic partitioning of overstory and understory carbon dioxide fluxes in Australian tropical savanna using overstory and understory eddy covariance measurements. Over a two year period (September 2012 to October 2014) the overall net ecosystem productivity (NEP) of the savanna was 506.2 (±22 SE) g C m−2 yr−1. The total gross primary productivity (GPP) was 2267.1 (±80 SE) g C m−2 yr−1, of which the understory contributed 32 %. The understory contribution was strongly seasonal, with most GPP occurring in the wet season (40 % of total ecosystem in the wet season and 18 % in the dry). This study is the first to elucidate the temporal dynamics of savanna understory and overstory carbon flux components explicitly using observational information. Understanding grass productivity is crucial for evaluating fuel loads, as is tree productivity for quantifying the tree carbon sink. This information will contribute to a significant refinement of the representation of savannas in models, as well as improved understanding of relative tree-grass productivity and competition for resources.

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Section: Gross Primary Productivitymentioning

confidence: 95%

Section: Site Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The contribution of trees and grasses to productivity of an Australian tropical savanna

Moore¹,

Beringer²,

Evans³

et al. 2015

Preprint

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Composition of the TTL over Darwin: local mixing or long-range transport?

et al. 2009

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Abstract. We present ozone and carbon monoxide measurements taken in Darwin, Australia, during the wet season of 2005/2006, to examine whether the composition of the Tropical Tropopause Layer (TTL) reflects that of the local boundary layer or is influenced more by advection from distant sources. We find that the latter predominates in the upper TTL, and is also the major influence in the lower TTL, except during an active monsoon phase. The day-to-day variability of ozone in the TTL is far greater than that in the lower troposphere, and correlates closely with air mass origin deduced from trajectory calculations based on standard ECMWF wind analyses. Although clear evidence of recent local uplift was found in carbon monoxide tracer measurements recorded inside convective anvils, no such signal was found out-of-cloud in the background TTL, where the measured variability correlated well with air mass origin deduced from back-trajectories. This study suggests that the composition of the TTL is ultimately determined by vertical mixing in certain "hot spot" regions of the tropics, with advection from these regions dominating the composition elsewhere.

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The SCOUT-O3 Darwin Aircraft Campaign: rationale and meteorology

Brunner¹,

Siegmund²,

May³

et al. 2008

Preprint

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Abstract. An aircraft measurement campaign involving the Russian high-altitude aircraft M55 Geophysica and the German DLR Falcon was conducted in Darwin, Australia in November and December 2005 as part of the European integrated project SCOUT-O3. The overall objectives of the campaign were to study the transport of trace gases through the tropical tropopause layer (TTL), mechanisms of dehydration close to the tropopause, and the role of deep convection in these processes. In this paper a detailed roadmap of the campaign is presented, including rationales for each flight, and an analysis of the local and large-scale meteorological context in which they were embedded. The campaign took place during the pre-monsoon season which is characterized by a pronounced diurnal evolution of deep convection including a mesoscale system over the Tiwi Islands north of Darwin known as "Hector". This allowed studying in detail the role of deep convection in structuring the tropical tropopause region, in situ sampling convective overshoots above storm anvils, and probing the structure of anvils and cirrus clouds by Lidar and a suite of in situ instruments onboard the two aircraft. The large-scale flow during the first half of the campaign was such that local flights, away from convection, sampled air masses downstream of the "cold trap" region over Indonesia. Abundant cirrus clouds enabled the study of active dehydration, in particular during two TTL survey flights. The campaign period also encompassed a Rossby wave breaking event transporting stratospheric air to the tropical middle troposphere and an equatorial Kelvin wave modulating tropopause temperatures and hence the conditions for dehydration.

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Correction to “Aerosol and trace‐gas measurements in the Darwin area during the wet season”

Cited by 6 publications

References 0 publications

The contribution of trees and grasses to productivity of an Australian tropical savanna

The contribution of trees and grasses to productivity of an Australian tropical savanna

Composition of the TTL over Darwin: local mixing or long-range transport?

The SCOUT-O3 Darwin Aircraft Campaign: rationale and meteorology

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