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18 results for “Drake Passage”
E3SM - Drake Passage Transport, 26.5 AMOC, Northward Heat Transport at 26.5N, from Hewitt et al 2020
<p>E3SM monthly output has been annually averaged and processed to derive the maximum overturning at 26.5 N, the northward heat transport at 26.5N and the drake passage transport. The model output includes the low resolution configuration and high resolution configuration. Both runs use the 1950 control from the HighResMIP protocol.</p>
FIGURE 5 in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 5. Caulophacus palmeri sp. nov. Type specimen MNHNCL POR_15001. A. collected specimen, scale in cm; B. end of diactin, scale bar 10 µm, SEM; C. pentactin, scale bar 100 µm, illustration traced from light microscope image; D. hexactin, scale bar 100 µm, illustration traced from light microscope image; E. pinular hexactin, scale bar 10 µm, SEM; F. discohexactin, scale bar 10 µm, SEM.
FIGURE 3 in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 3. Doconesthes robinsoni sp. nov. Type specimen MNHNCL POR–15002. A. Freshly collected specimen, scale in cm; B. Rehydrated specimen, scale in cm; C. Atrium of rehydrated specimen, scale in cm; D. Hypodermal pentactin, illustration traced from light microscope image, scale 100 µm; E. Atrial hexactine, illustration traced from light microscope image, scale 100 µm F. End of choanosomal diactin, scale 200 µm, light microscope; G. Dermal diactin, scale 100 µm, light microscope; H. Hemioxyhexaster, scale 10 µm, SEM; I. Strobiloplumicome, scale 10 µm, SEM, the frontal ray is missing.
FIGURE 2 in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 2. Aulocalyx irregularis, specimen BELUM.Mc2015.308. A. Collected specimen. scale in cm; B. Skeletal framework, Scale bar 1000 µm, SEM; C. Pentactin, scale bar 100 µm, SEM, D. Discohexaster, scale bar 10 µm, SEM; E. Rhopalaster, scale bar 100 µm, SEM.
FIGURE 1. Sampling locations. A in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 1. Sampling locations. A, Sars Seamount, B Shackleton Fracture Zone. Inset: box indicates the area shown in larger figure.
FIGURE 6 in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 6. Rossella antarctica: A. Collected specimen BELUM.Mc2015.284; B. Specimen BELUM.Mc2015.335; C. Rays of a calycocome from BELUM.Mc2015.284 (scale bar 10um); D. Microdiscohexaster from BELUM.Mc2015.284 (scale bar 10 µm).
FIGURE 4 in Hexactinellida (Porifera) from the Drake Passage (Southern Ocean) with a description of three new species
FIGURE 4. Sympagella walleri sp. nov. Type specimen MNHNCL POR-15003, strobiloplumicome image G from BELUM.Mc2015.313. A. Collected specimen; B. End of diactin, scale bar 200 µm, light microscope; C. Dermal pentactin, scale bar 100 µm, illustration traced from light microscope image; D. Dermal hexactin, scale bar 100 µm, illustration traced from light microscope image; E. Pinular hexactin, scale bar 10 µm, SEM; F. Discohexaster, scale bar 10 µm, SEM; G, H. Strobiloplumicome, scale bar 10 µm, SEM.
Distribution. Coastal waters of S South America from ¢.33° S in the Pacific Ocean and c.38° Sin the Atlantic Ocean, and S into Drake Passage (c.59° S) and Falkland Is. in Delphinidae
Distribution. Coastal waters of S South America from ¢.33° S in the Pacific Ocean and c.38° Sin the Atlantic Ocean, and S into Drake Passage (c.59° S) and Falkland Is.
Figure 4 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 4. Distribution of total zooplankton biomass (mg/m3) in the layer 0–200 m. (A) Distribution of total biomass; circle area proportional to biomass value. Background and scale below: temperature (◦C) at a depth of 10 m; dotted line: boundary of the Polar Front. (B) Average zooplankton biomass. (C) Distribution of the total zooplankton biomass along frontal transect; dotted line: boundary of the Polar Front.
Figure 7 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 7. Biomass (mg/m3) of dominant copepods in the layer 0–200 m. Dotted line: boundary of the Polar Front.
Figure 1 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 1. Distribution of dominant copepod species in the Subantarctic Zone (SAZ), Polar Frontal Zone (PFZ) and Antarctic Zone (AZ). PF, Polar Front. Wide solid line indicates maximal abundance (75–100% of maximal recorded values), thin solid line indicates intermediate abundance (50–75% of maximal recorded values), and thin dotted line indicates minimal abundance (<50% of maximal recorded values).
Figure 3 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 3. (A) Examples of the T-S diagrams for Polar Frontal Zone (St. 2060), Polar Front (St. 2088) and Antarctic Zone (St. 2105). (B) Current vectors at a depth of 100 m (Koshlyakov et al., 2010). Circles mark hydrological stations, depths <2500 m are shaded.
Figure 6 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 6. Contribution of dominant copepods to the total biomass of each zone. 1. Calanus simillimus; 2. Calanoides acutus; 3. Rhincalanus gigas; 4. remaining species. PFZ, Polar Frontal Zone; PF, Polar Front; AZ, Antarctic Zone.
Figure 5 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 5. Distribution of chlorophyll a values integrated over the euphotic zone (Chlph) in the study area in the Drake Passage, October–November 2008 (Demidov et al. 2011). Open circles indicate stations. PFZ, Polar Front Zone; PF, Polar Front; AZ, Antarctic Zone; SPC, South Polar Current.
Figure 8 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 8. Contribution of the dominant species and groups of zooplankton to the total biomass along the transects.
Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?
<p>Datasets for the Journal of Geophysical Research: Oceans publication: "Antarctic Circumpolar Current transport through Drake Passage: What can we learn from comparing high-resolution model results to observations?"</p> <p>[Abstract] Uncertainty exists in the time-mean total transport of the Antarctic Circumpolar Current (ACC), the world’s strongest ocean current. The two most recent observational programs in Drake Passage, DRAKE and cDrake, yielded transports of 141 and 173.3 Sv, respectively. In this paper, we use a realistic 1/12° global ocean simulation to interpret these observational estimates and reconcile their differences. We first show that the modeled ACC transport in the upper 1000 m is in excellent agreement with repeat shipboard acoustic Doppler current profiler (SADCP) transects and that the exponentially decaying transport profile in the model is consistent with the profile derived from repeat hydrographic data. By further comparing the model results to the cDrake and DRAKE observations, we argue that the modeled 157.3 Sv transport, i.e. approximately the average of the cDrake and DRAKE estimates, is actually representative of the time-mean ACC transport through the Drake Passage. The cDrake experiment overestimates the barotropic contribution in part because the array undersampled the deep recirculation southwest of the Shackleton Fracture Zone, whereas the surface geostrophic currents used in the DRAKE estimate yielded a weaker near-surface transport than implied by the SADCP data. We also find that the modeled baroclinic and barotropic transports are not correlated, thus monitoring either baroclinic or barotropic transport alone may be insufficient to assess the temporal variability of the total ACC transport.</p>
Measurements off the Argentinian coast near Drakes Passage
Measurements made in the South Atlantic Ocean in 2008 and 2009 off the Argentinian coast near Drakes Passage.
Figure 2 in High-resolution survey indicates high heterogeneity in copepod distribution in the hydrologically active Drake Passage
Figure 2. Map showing station positions (open circles). Background and scale below: temperature (◦C) at a depth of 10 m. PF, Polar Front. L1–L6, frontal transects.
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