This document describes one of the latest contributions of the Spanish Institute of Oceanography to the ARGO international network. It’s the deployment of a Deep Arvor profiler in the Eastern Atlantic. Thanks to this device, obtaining data of temperature and salinity up to 4000 meters of depth is feasible. Technical characteristics and previous results are attached

González-Santana, J.A. (Juan Alberto)

Vélez-Belchí, P. (Pedro)

English

Informe de lanzamiento del perfilador 690124

Repositorio Institucional Digital del IEO

					Report	on	Deep	–	Arvor	Float	deployment	in	the	Northeast	Atlantic	Ocean,	Canary	Basin.				ARGO	ESPAÑA	–	IEO				March	21,	2017																												A.Gonzalez	Santana	–	P.Velez	Belchí	Instituto	Español	de	Oceanografía	Deep	–	Arvor	Float	deployment	in	the	Northeast	Atlantic	Ocean,	Canary	Basin.			In	 order	 to	 contribute	 to	 the	 Argo	 International	 Program	 Fleet,	 a	 Deep	 –	Arvor	float	was	deployed	in	the	Northeast	Atlantic	Ocean,	next	to	La	Palma	island	(Canary	 Islands	 archipelago).	 This	 area	 is	 mainly	 known	 by	 its	 drastic	 depth	gradient,	which	can	exceed	4000	m	of	depth	(Fig.	1).	Getting	oceanographic	data	from	this	threshold	to	surface	confirms	another	step	forward	in	the	oceanography	era.																										Figure	1.	Deep	–	Argo	float	deployment	area	next	to	La	Palma	island.			The	 Deep	 –	 Arvor	 was	 deployed	 on	 November	 1st	 2016	 by	 the	 Spanish	Institute	 of	 Oceanography	 researchers	 from	 Ángeles	 Alvariño	 vessel	 during	 the	RAPROCAN	 2016	 survey.	 After	 roughly	 5	 months	 at	 sea,	 the	 Deep	 –	 Arvor	 is	currently	 diving	 towards	 to	 open	 sea	 (Fig	 1.).	 The	 float	 has	 carried	 out	 27	high-resolution	 vertical	 profiles	 of	 temperature	 and	 salinity	 so	 far	 but	 is	 planned	 to	perform	about	300	profiles.	This	is	the	second	time	a	Deep	–	Arvor	is	deployed	in	the	same	area	of	study	by	the	Spanish	Institute	of	Oceanography.				FLOAT	PROGRAMMING	AND	DEPLOYMENT			 	This	float	version	of	NKE	Instrumentation	has	been	manufactured	and	developed	in	industrial	partnership	with	IFREMER	for	data	collection	and	positioning	by	IRIDIUM	and	GPS.	Some	of	its	technical	specifications	are	detailed	in	Table	1.		4000	SBE	41	CP	with	pump	Seabird	Electronics	•	Salinity																															Range	0	to	42	PSU																																																		Initial	accuracy	±	0.005	PSU																																																		Observed	drift	<	0.01	PSU	/	5	years	•	Temperature																				Range	-5°	C	to	+35°	C																																																		Initial	accuracy	±	0.002°	C																																																		Observed	drift	<	0.002°	C	/	5	years	•	Pressure																													Range	0	dbars	to	4100	dBars																																																			Initial	accuracy	±	2.4	dBar																																																		Drift	<	5	dBar	/	5	years																																																		Offset	reset	before	dive	at	each	surfacing	FLOAT	DIMENSIONS	Overall	Length	216	cm	with	antenna	Hull	Length	120	cm	Hull	Diameter	14	cm	Damping	collar	25	x	25	cm	Weight	26	kg	FLOAT	CONSTRUCTION	Carbon	epoxy	housing	BUOYANCY	CONTROL	Principle	Oil	ballast	with	pump	&	valve	Positioning	accuracy	±	50m	OPERATION	FEATURES	Operation	depth	until	4000	dBars	Sampling	and	transmission	up	to	2000	points	Computed	number	of	profiles																More	than	150	cycles	to	4000	bars/CTD																More	than	225	1/5	4000/2000	CTD	/	DO	Number	of	profiles	programmable	Operating	temperature	-2°C	to	+35°C	POWER	SUPPLY	Lithium	cells	USER	INTERFACE	A	-	Bluetooth	User	Interface																	Mission	programming,	float	checking,	etc.																	Terminal:	Personal	Computer	B	-	Remote	control	by	IRIDIUM	TELEMETRY	IRIDIUM	system	Iridium	SBD	GPS	Resolution	of	transmitted	measurements:																•	Salinity																		0.001	PSU																•	Temperature							0.001°C																•	Pressure																0.1	dbar																•	DO																											0.002°		Table	1.	List	of	Deep	Arvor’s	specifications.		A	configuration	parameters	step	is	needed	before	the	deployment	phase	(Fig.	2).	For	our	purposes,	the	float	was	initially	programmed	to	dive	every	5	days	measuring	temperature	and	salinity	during	the	ascending	phase.	After	that,	the	float	is	planned	to	dive	every	10	days	reaching	also	4000	meters	of	depth.	One	of	the	aims	of	this	change	is	to	save	energy	and	to	extend	the	lithium	battery	life	as	much	as	possible	(3.5	–	4	years	luckily).																																		Figure	2.	Argo’s	configuration	step	through	Bluetooth	connection	before	the	deployment	phase.	Comparison	of	CTD	and	Deep	–	Arvor	profiles		The	float	was	deployed	on	the	1st	of	November	at	29,10.00	ºN	and	18,29.78	ºW.	A	first	test	profile	was	expected	for	the	next	hours	but	the	float	suffered	some	unknown	technical	issues.	A	CTD	rosette	was	carried	out	in	the	same	area	[station	24]	to	collect	oceanographic	data.			The	next	Deep	–	Arvor	profiles	were	taken	around	the	same	area	in	order	to	make	a	comparison	with	CTD	data.	The	T-S	diagram	shows	a	significant	agreement	between	both	set	of	data	(Fig.	3).		The	first	Deep	–	Arvor	profiles	are,	within	the	precision	of	both	equipment,	the	same	as	the	CTD	from	Raprocan1016.		This	confirms	that	the	float	is	working	properly	with	no	significant	drifts	at	the	moment.	Also	in	the	T-S	diagram,	several	water	masses	can	be	identified	at	some	stretches	according	to	the	characteristics	of	the	sampled	area	(North	Atlantic	Central	Water	-	NACW,	Intermediate	Antartic	Water	–	AAIW,	Mediterranean	Water	–	MW	and	North	Atlantic	Deep	Water	–	NADW).							 																						Figure	3.	T-S	Diagram	of	the	sampled	area.			

Report on Deep – Arvor Float deployment in the Northeast  Atlantic Ocean, Canary Basin

González-Santana, Juan Alberto

Vélez-Belchí, Pedro

Digital.CSIC

Deep – Arvor Float deployment in the Northeast Atlantic Ocean, Canary Basin.

					Report	on	Deep	–	Arvor	Float	deployment	in	the	Northeast	Atlantic	Ocean,	Canary	Basin.				ARGO	ESPAÑA	–	IEO				March	21,	2017																												A.Gonzalez	Santana	–	P.Velez	Belchí	Instituto	Español	de	Oceanografía	Deep	–	Arvor	Float	deployment	in	the	Northeast	Atlantic	Ocean,	Canary	Basin.			 In	 order	 to	 contribute	 to	 the	 Argo	 International	 Program	 Fleet,	 a	 Deep	 –	Arvor	float	was	deployed	in	the	Northeast	Atlantic	Ocean,	next	to	La	Palma	island	(Canary	 Islands	 archipelago).	 This	 area	 is	 mainly	 known	 by	 its	 drastic	 depth	gradient,	which	can	exceed	4000	m	of	depth	(Fig.	1).	Getting	oceanographic	data	from	this	threshold	to	surface	confirms	another	step	forward	in	the	oceanography	era.	 																									 Figure	1.	Deep	–	Argo	float	deployment	area	next	to	La	Palma	island.			The	 Deep	 –	 Arvor	 was	 deployed	 on	 November	 1st	 2016	 by	 the	 Spanish	Institute	 of	 Oceanography	 researchers	 from	 Ángeles	 Alvariño	 vessel	 during	 the	RAPROCAN	 2016	 survey.	 After	 roughly	 5	 months	 at	 sea,	 the	 Deep	 –	 Arvor	 is	currently	 diving	 towards	 to	 open	 sea	 (Fig	 1.).	 The	 float	 has	 carried	 out	 27	high-resolution	 vertical	 profiles	 of	 temperature	 and	 salinity	 so	 far	 but	 is	 planned	 to	perform	about	300	profiles.	This	is	the	second	time	a	Deep	–	Arvor	is	deployed	in	the	same	area	of	study	by	the	Spanish	Institute	of	Oceanography.				FLOAT	PROGRAMMING	AND	DEPLOYMENT			 	This	float	version	of	NKE	Instrumentation	has	been	manufactured	and	developed	in	industrial	partnership	with	IFREMER	for	data	collection	and	positioning	by	IRIDIUM	and	GPS.	Some	of	its	technical	specifications	are	detailed	in	Table	1.		4000	SBE	41	CP	with	pump	Seabird	Electronics	•	Salinity																															Range	0	to	42	PSU																																																		Initial	accuracy	±	0.005	PSU																																																		Observed	drift	<	0.01	PSU	/	5	years	•	Temperature																				Range	-5°	C	to	+35°	C																																																		Initial	accuracy	±	0.002°	C																																																		Observed	drift	<	0.002°	C	/	5	years	•	Pressure																													Range	0	dbars	to	4100	dBars																																																			Initial	accuracy	±	2.4	dBar																																																		Drift	<	5	dBar	/	5	years																																																		Offset	reset	before	dive	at	each	surfacing	FLOAT	DIMENSIONS	Overall	Length	216	cm	with	antenna	Hull	Length	120	cm	Hull	Diameter	14	cm	Damping	collar	25	x	25	cm	Weight	26	kg	FLOAT	CONSTRUCTION	Carbon	epoxy	housing	BUOYANCY	CONTROL	Principle	Oil	ballast	with	pump	&	valve	Positioning	accuracy	±	50m	OPERATION	FEATURES	Operation	depth	until	4000	dBars	Sampling	and	transmission	up	to	2000	points	Computed	number	of	profiles																More	than	150	cycles	to	4000	bars/CTD																More	than	225	1/5	4000/2000	CTD	/	DO	Number	of	profiles	programmable	Operating	temperature	-2°C	to	+35°C	POWER	SUPPLY	Lithium	cells	USER	INTERFACE	A	-	Bluetooth	User	Interface																	Mission	programming,	float	checking,	etc.																	Terminal:	Personal	Computer	B	-	Remote	control	by	IRIDIUM	TELEMETRY	IRIDIUM	system	Iridium	SBD	GPS	Resolution	of	transmitted	measurements:																•	Salinity																		0.001	PSU																•	Temperature							0.001°C																•	Pressure																0.1	dbar																•	DO																											0.002°	 	Table	1.	List	of	Deep	Arvor’s	specifications.		 A	configuration	parameters	step	is	needed	before	the	deployment	phase	(Fig.	2).	For	our	purposes,	the	float	was	initially	programmed	to	dive	every	5	days	measuring	temperature	and	salinity	during	the	ascending	phase.	After	that,	the	float	is	planned	to	dive	every	10	days	reaching	also	4000	meters	of	depth.	One	of	the	aims	of	this	change	is	to	save	energy	and	to	extend	the	lithium	battery	life	as	much	as	possible	(3.5	–	4	years	luckily).																																	 	Figure	2.	Argo’s	configuration	step	through	Bluetooth	connection	before	the	deployment	phase.	Comparison	of	CTD	and	Deep	–	Arvor	profiles		 The	float	was	deployed	on	the	1st	of	November	at	29,10.00	ºN	and	18,29.78	ºW.	A	first	test	profile	was	expected	for	the	next	hours	but	the	float	suffered	some	unknown	technical	issues.	A	CTD	rosette	was	carried	out	in	the	same	area	[station	24]	to	collect	oceanographic	data.			 The	next	Deep	–	Arvor	profiles	were	taken	around	the	same	area	in	order	to	make	a	comparison	with	CTD	data.	The	T-S	diagram	shows	a	significant	agreement	between	both	set	of	data	(Fig.	3).		The	first	Deep	–	Arvor	profiles	are,	within	the	precision	of	both	equipment,	the	same	as	the	CTD	from	Raprocan1016.		This	confirms	that	the	float	is	working	properly	with	no	significant	drifts	at	the	moment.	Also	in	the	T-S	diagram,	several	water	masses	can	be	identified	at	some	stretches	according	to	the	characteristics	of	the	sampled	area	(North	Atlantic	Central	Water	-	NACW,	Intermediate	Antartic	Water	–	AAIW,	Mediterranean	Water	–	MW	and	North	Atlantic	Deep	Water	–	NADW).							 																						 Figure	3.	T-S	Diagram	of	the	sampled	area.			

Informe de lanzamiento del perfilador 6901248Contribución española a la red Argo: infraestructura para la observación del océano global.ARG

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/12236/1/6901248InformeLanzamiento.pdf

Deep – Arvor Float deployment in the Northeast Atlantic Ocean, Canary Basin.

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Digital.CSIC

Repositorio Institucional Digital del IEO

Digital.CSIC