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Sampling:
ABLE 6218 (aka Velella) – constant depth of 3m
ABLE 6155 (aka Cyprid) – diel vertical migration 3-15m, 2.0 cm/s, up 3:00/down 13:00
ABLE 6157 (aka Pteropod) – diel vertical migration 3-15m, 2.0 cm/s, up 3:00/down 13:00
ABLE 5996 (aka Pluteus) – constant depth 15m
ABLE 6031 (aka Melibe) – constant depth 15m

We simulated documented behaviors using the Autonomous Behaving Lagrangian Explorer (ABLE). ABLE, designed by Tom Wolcott, is a biomimetic robotic drifter that senses in situ environmental stimuli (e.g., variations in PAR, pressure, salinity, or temperature). It can be programmed to maintain depth or vertically migrate in response to in-situ variables, like the larvae under study. It can reveal quasi-Lagrangian transport of vertically migrating plankters that swim between water parcels at different depths. ABLE weighs 3 kg and is 36 cm tall, topped by a 15 cm antenna mast. It necessarily integrates water motions at and below its own scale. Consequently, it cannot mimic transport of individual plankters, nor diffusive processes at scales smaller than its own. ABLE best simulates the transport of the centroid of a cloud of plankters that is large relative to its own dimensions.

ABLE dynamically calculates its target depth from measurements of its immediate microenvironment and a behavioral model for the organism being simulated. It moves toward the new target depth at a biologically realistic velocity, permitting it to show transport consequences of adaptive behaviors in response to actual (not average) conditions and actual (not modeled) water movements. Because behavioral patterns are under the experimenter’s control, ABLE can reveal effects of either known or hypothetical behavior patterns. ABLE has no structures outside the parcel of water in which it is embedded, hence no extraneous drag that would cause drift errors. Use of ABLE (unlike modeling) requires no a priori characterization of the system before the first data can be collected; immediately upon deployment it begins yielding information on how water and organisms in the system move.

Although ABLE has no extraneous drag, hence no drift errors, while embedded in the tracked water parcel, it must periodically leave that parcel and make excursions to the surface to obtain and transmit GPS fixes. A drift error is created by velocity differences (relative to the target parcel) at other depths multiplied by the time ABLE spends transiting each during a pop-up, which cannot be simply estimated in heterogeneous systems. A rule of thumb analogous to that for suspended-drogue drifters would be that ABLE must spend <1/40 of the time making excursions to the surface. As target (operating) depth increases, transit time to the surface increases, and hence allowable fix frequency decreases.

To facilitate tracking, it has an ultrasonic beacon that provides bearings and telemeters depth during operation at depth; when at the surface it obtains fixes from its GPS receiver and transmits the fix data by VHF radio (short range) and satellite modem (global range). The GPS fix obtained at each surface interval is logged in ABLE’s data memory, even if it is not received by the Globalstar satellite system. To facilitate recovery at the sea surface, it transmits updated fixes continuously by VHF and periodically via satellite while blinking high-brightness LED beacons for visual fixes. We also command ABLE to surface for recovery by decoding ultrasonic signals while rejecting noise from surf and biota. It senses the bottom and swims up a programmed distance above the substrate.

When deployed, it uses measurements of in-situ variables (depth, T, S, PAR, time of day, vertical speed relative to water). It subtly adjusts buoyancy (by < 1g) to "swim" toward that target depth, maintaining a rate realistic for the organism being simulated (0 to >10 cm/s). It periodically pops to the surface to obtain a GPS fix and transmit it by VHF, ultrasonic pinger and satellite (or cell phone) modem. Along its entire trajectory, it logs in-situ measurements; the suite of variables and frequency of logging are user-selectable. On the bench, ABLE communicates by wireless Bluetooth with a host computer or smart phone and presents a menu for downloading logged data, testing and calibrating sensors, altering data logging parameters, or even rewriting the entire program. Endurance during deployments is about 2 wk with 7 NiMH "D" cells, depending on frequency of excursions to the surface and pumping of ballast to hoist antennas.

ABLEs were deployed by boat at pre-defined locations and retrieved a pre-defined number of days later.

1d:T8ec,Description from NSF award abstract: The majority of larvae of coastal marine species are planktonic and generally weak swimmers. Thus, they are thought to be dispersed widely by coastal currents. However, there is accumulating evidence that their behavior can strongly influence their transport: some remain within estuaries, while others make true migrations between adult and larval habitats, even out to the edge of the continental shelf and back. Rates and directions of larval transport are thought to be determined largely by the timing, duration, and amplitude of vertical migrations and the mean depth that larvae occupy in stratified flows. The PIs propose to provide one of the first direct tests of how behavior affects across-shelf and alongshore transport using biomimetic drifters. The study will be conducted in a region of persistent upwelling, where strong currents are widely believed to overwhelm larval swimming and limit recruitment to adult populations. Knowledge of underlying mechanisms regulating larval transport is central to understanding ecology and evolution in the sea and anticipating the impacts of climate change on marine populations and communities. The proposed research will provide the first experimental field-test of how larval behavior affects the rates, directions and distances of transport and population connectivity in an upwelling regime. The PIs will test three hypotheses: 1. Residence below the wind-driven surface layer and vertical migrations below that layer keep larvae closer to shore compared to residence in the surface layer or larvae without depth preferences and vertical migration. 2. Residence at depth enhances northward transport near shore, and vertical migration leads to decreased alongshore mean displacement but increased variance for a group. 3. Depth preferences and vertical migrations have pronounced effects on retention and transport of plankton in upwelling regions. The study will compare direct measurements from mimetic drifters with observed and modeled cross-shelf larval distributions, and with modeled alongshore transport. Results will be broadly applicable to upwelling regimes along the western margins of continents, and the approach can be applied to non-upwelling systems throughout the world.6:["$","$L1b",null,{"dataset":{"_id":"681042","description":"

Autonomous Behaving Lagrangian Explorer (ABLE) output for 5 taxonomic groups (Cyprid, Melibe, Pluteus, Pteropod, and Velella).

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Data has been manually reformatted to accommodate columns and rows.
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\n5 – no data.

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\n-modified parameter names to conform with BCO-DMO naming conventions;
\n-formatted dates to yyyy-mm-dd and times to HH:MM:SS;
\n-replaced blanks (missing data) with 'nd';
\n-added ISO_DateTime_UTC field using original date and time columns.

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Taxonomic group examined using ABLE

","units":{"_id":"","name":"unitless"},"type":{"_id":"994","name":"taxon","description":"

taxonomic group or entity. This may be a family, class, genus, species, etc.; usually this parameter will contain a mixture of taxonomic entities.

"}},{"_id":"681400","name":"cumulative_secs","format":"","frictionlessType":"","description":"

Cumulative seconds

","units":{"_id":"","name":"seconds"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681401","name":"date_utc","format":"","frictionlessType":"","description":"

Date (UTC) formatted as yyyy-mm-dd

","units":{"_id":"","name":"unitless"},"type":{"_id":"798","name":"date_utc","description":"

UTC month, day and year, usually as a text string, e.g. feb10_1995. It is better to use one of the other forms of presenting date and time data so that the data can be used in computations and for comparisons. Note, if the string begins with numbers but also includes letters, there may be problems using the field name for retrieval. Use date_gmt for future data sets.

"}},{"_id":"681402","name":"time_utc","format":"","frictionlessType":"","description":"

Time (UTC) formatted as HH:MM:SS

","units":{"_id":"","name":"unitless"},"type":{"_id":"1011","name":"time_utc","description":"

UTC time, using 2400 clock format

"}},{"_id":"681403","name":"Z","format":"","frictionlessType":"","description":"

Current depth

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681404","name":"Z_flag","format":"","frictionlessType":"","description":"

Quality flag for current depth: 0 – no QC, 1 – good, 2 – unreliable, 3 – bad, 4 – changed, 5 – no data.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681405","name":"target_Z","format":"","frictionlessType":"","description":"

Target depth in meters

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681406","name":"Z_bot","format":"","frictionlessType":"","description":"

Assumed bottom depth

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681407","name":"temp","format":"","frictionlessType":"","description":"

Temperature

","units":{"_id":"","name":"degrees Centigrade (C)"},"type":{"_id":"733","name":"temperature","description":"

water temperature at measurement depth

"}},{"_id":"681408","name":"temp_flag","format":"","frictionlessType":"","description":"

Quality flag for temperature: 0 – no QC, 1 – good, 2 – unreliable, 3 – bad, 4 – changed, 5 – no data

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681409","name":"PAR","format":"","frictionlessType":"","description":"

Photosynthetically active radiation (PAR)

","units":{"_id":"","name":"moles per square meter per second (mol m-2 s-1)"},"type":{"_id":"913","name":"PAR","description":"

Photosynthetically Available [Active] Radiation; downwelling irradiance; units vary: off microEinsteins/meter^2/second, microEinsteins/centimeter^2/second, or micromoles photons/meter/second

"}},{"_id":"681410","name":"PAR_flag","format":"","frictionlessType":"","description":"

Quality flag for PAR: 0 – no QC, 1 – good, 2 – unreliable, 3 – bad, 4 – changed, 5 – no data

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681411","name":"sal","format":"","frictionlessType":"","description":"

Salinity

","units":{"_id":"","name":"practical salinity scale (PSU)"},"type":{"_id":"955","name":"sal","description":"

Salinity: The amount (mass or quantity of matter) of salt per amount (volume or mass) of a body of water.

"}},{"_id":"681412","name":"sal_flag","format":"","frictionlessType":"","description":"

Quality flag for salinity: 0 – no QC, 1 – good, 2 – unreliable, 3 – bad, 4 – changed, 5 – no data

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681413","name":"ang_vel_X","format":"","frictionlessType":"","description":"

Angular velocity in x direction

","units":{"_id":"","name":"unitless (raw counts from the gyro)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681414","name":"ang_vel_Y","format":"","frictionlessType":"","description":"

Angular velocity in y direction

","units":{"_id":"","name":"unitless (raw counts from the gyro)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681415","name":"ang_vel_Z","format":"","frictionlessType":"","description":"

Angular velocity in z direction

","units":{"_id":"","name":"unitless (raw counts from the gyro)"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

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Number of pump strokes in a downward direction

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681417","name":"pump_up","format":"","frictionlessType":"","description":"

Number of pump strokes in an upward direction

","units":{"_id":"","name":"unitless"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681418","name":"lat","format":"","frictionlessType":"","description":"

Latitude

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"681419","name":"lon","format":"","frictionlessType":"","description":"

Longitude

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes

"}},{"_id":"681420","name":"DOP","format":"","frictionlessType":"","description":"

Dilution of precision for GPS quality

","units":{"_id":"","name":"unitless"},"type":{"_id":"1746","name":"Dissolved Organic Phosphorus","description":"

Dissolved Organic Phosphorus is the concentration of total organic dissolved phosphorus per unit volume of the water column

"}},{"_id":"681421","name":"batt_V","format":"","frictionlessType":"","description":"

Battery voltage

","units":{"_id":"","name":"volts"},"type":{"_id":"1073","name":"no_bcodmo_term","description":"

An association with a community-wide standard parameter has not yet been made.

"}},{"_id":"681422","name":"ISO_DateTime_UTC","format":"","frictionlessType":"","description":"

Date and time (UTC) formatted ISO 8601 standard: yyyy-mm-ddTHH:MM:SS.xxZ (where T indicates the start of the time string and Z indicates UTC)

","units":{"_id":"","name":"unitless"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Date/Time (UTC) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

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