Centro de Conservación y Aprovechamiento de los Recursos Naturales (CECARENA), Instituto Tecnológico y de Estudios Superiores de Monterrey (ITESM), Campus Guaymas. Campus Guaymas María Esther Cruz Colín, ITESM, Campus Guaymas Juan Antonio Delgado, ITESM, Campus Guaymas/ITMAR Stephen Monismith, Stanford University Arnoldo Valle-Levinson, CCPO, Old Dominion University, VA Some Observations at Lobos Bay, 2004 Environmental Studies for sustainable management of two bays of semidesertic climate: El Tóbari y Lobos, Sonora, Mexico.

Start in Lobos (2004) February:CONACyT funds arrive. ADCP update (sent it to RDI -San Diego delayed 3 months almost!), bought OD and pH CTD sensor. May:Set in Lobos weather station June:Bathymetry July: Proceessing data of Tobari, and Lobos August: 35 days mooring at South inlet Lobos September (21-25): Simultaneous transects at Lobos inlets (we use equipment’s Tec and Old Dominion University). October:35 days mooring at North inlet Lobos (now is there). Attend to XII International Conference on Physics of Estuaries and Coastal Seas, Mérida, Yucatán, Mex.

At its first part we worked in Tobari bay (2003), but we not finish yet, fault take sediments samples to distinguish the bottom sediments (to acomplish work’s Mike) Proccessing data Modelling !

What do we expect to find? Some likeness Tóbari (or not). Delucidate who is responsible currents: tide, wind, density or bathymetry. Tools to understand the sediments, larvas, nutrients transport.

To get spatial variability of temperature, salinity, DO, pH, monthly Bathymetry (mapping) Hydrodgraphy Measurements at the mouths (to get the spatial an temporal of the water circulation at boths mouths Take a sediments samples (in order to description) Desarrollo de un modelo numérico (simulación numérica) Set in place a Weather Station Working at Lobos Bay

Bahía Lobos Bahía de Guaymas Golfo de California Bahía del Tóbari Valle del Yaqui: Distrito de Irrigación

Longitude Latitude ADCP/CTD fix, August,2004 ADCP/CTD fix, September- October, 2004 ADCP towed September, 2004, simultaneously Salinera del Valle Lobos

Laying the weather station at salt fabric ( Salinera del Valle, S.A. de C.V. –Thanks to Francisco Fernández Ortega, owner-chief manager) Start to measure from beginning May, dt = 15 mins. Temperature, wind, HR, DewPt, Bar, Rain, UV, SolaRad, ET

Bathymetry measurements. June, 2004 Lobos Bay bathymetry, 2004

Some results in Lobos Tide: Mixta Diurnal Temperature, Salinity, Density: diurnal variability. Density is in relation Salinity

cm/s Spring tide neap tide Spring tide neap tide Current (envolvente) comp V, filtered Temperature filtered Residual flux at South inlet adcp=4 mts

10 20 Wind Speed m/sRelative Humidity Net Outflow Net Inflow

S N EW Wind direction No rain, no tropical storm Net inflow

Wind direction rain, tropical storm Wind direction rain, tropical storm Howard, 09/03/2004 N WE S Net outflow

cm/s Spring tide neap tide Spring tide neap tide Wind Direction from NW Precipitation Event anomally

1.Which mechanics produce this correlation? 2.Must be a physical process to gain O2 and biological to lost? 3.Why O 2 decreases in a few time? O 2 max | ū| max 8 29 August, 2004 O 2 (mg/L) |ū| (m/s)

Rhumb (hypotesis) This suggest us that the residuals currents at Lobos are driven by synoptics wind principally. Due to high currents magnitudes the stratification is low. Lobos observations will be a tool to demonstrate that the causeway has been changed the residual circulation, producing a quick siltation.

Yaquis are not same Mayos. They are agree we make a project in Yaqui lagoon. They know the project (we give them a talk about). However they have a few lack of interesting and they aren´t involve, nevertheless they hold theirs lagoon healty. Threat, but no impediment

Information available to who incumbent in the project (TEC, Stanford, SEMARNAT, CONACyT, municipality, community, whos will be beneficiary Brochure, posters, internet (web), technical reports Diffusion Link with others areas policy perspectives who how what

Acknowledgments Researcher (Old Dominion University, UABC, CICESE) Guaymas’s cooperativas pesqueras Students, (special thanks to Alyson Santoro, Nick Nidziecko, Mike Beman, Benjamin, Enrique y Rafael) last intensive measurement the last month.