SLIDE 1
Vali lidation o n of t the he A Ant ntarctic S Sno now A - - PowerPoint PPT Presentation
Vali lidation o n of t the he A Ant ntarctic S Sno now A - - PowerPoint PPT Presentation
Vali lidation o n of t the he A Ant ntarctic S Sno now A Accumu mula lation a n and nd Ic Ice Di Discha harge B Basal S l Stress B Bound ndary o y of t the he S Southe heastern n Region o n of t the he R Ross Ic Ice
SLIDE 2
SLIDE 3
MENTOR
Michael Jefferson Jr. Elizabeth City State University
SLIDE 4
OVERVIEW
- Ab
Abstract
- Int
Introduction n
- Metho
hodolo logy y
- Conc
nclu lusion n
- Future W
Work k
- Ackno
knowle ledgeme ment nts
- Questions
ns
SLIDE 5
ABSTRACT
The he la largest i ice s she helf lf i in A n Ant ntarctic, R , Ross Ic Ice S She helf lf, w , was i investigated o
- ver t
the he y years o
- f
(1970-2
- 2015). N
. Near t the he b basal s l stress b bound ndary b y between t n the he i ice s she helf lf a and nd t the he W West Ant ntarctic i ice s she heet, i , ice v velo locity r y rang nges f from a m a f few me meters p per y year t to s several hu l hund ndred me meters p per y year i in i n ice s streams
- ms. Ic
. Ice v velo locity i y inc ncreases a as t the he i ice mo moves s seaward, , reachi hing ng mo more t tha han 1 n 1 km yr km yr-1
- 1 i
in t n the he c cent ntral p l portions ns o
- f t
the he i ice f front
- nt. M
. Most o
- f t
the he draina nage f from W m West A Ant ntarctica i int nto t the he R Ross Ic Ice S She helf lf f flo lows d down t n two ma majo jor i ice s streams ms, , each o h of w whi hich d h discha harges mo more t tha han 2 n 20 km3 km3 o
- f i
ice e each y h year. . Alo long ng w with v h velo locity c y cha hang nges, t , the he w warme mest w water b belo low p parts o
- f t
the he R Ross Ic Ice S She helf lf r resides in t n the he lo lowest p portion o n of t the he w water c colu lumn b mn because o
- f i
its hi high s h sali lini
- nity. V
. Vertical mi l mixing ng caused b by t y tidal s l stirring ng c can t n thu hus i ind nduce a abla lation b n by li y lifting ng t the he w warm w m water i int nto c cont ntact with t h the he i ice s she helf
- lf. T
. Thi his p process c can c n cause me melt lting ng o
- ver a
a p period o
- f t
time me a and nd e event ntually lly cause b breakup o
- f i
ice s she helf lf. . With c h cha hang nges o
- ccurring
ng o
- ver ma
many y y years a a v vali lidation i n is ne needed f for t the he A Ant ntarctic S Sno now Accumu mula lation a n and nd Ic Ice Di Discha harge ( (ASAID) ID) b basal s l stress b bound ndary c y created i in 2 n 2003. A . After the he 2 2002 L Larsen B n B Ic Ice S She helf lf d disint ntegration, ne n, nearby g y gla laciers i in t n the he A Ant ntarctic P Peni nins nsula la accele lerated u up t to e eight ht t time mes t the heir o
- rigina
nal s l speed o
- ver t
the he ne next 1 18 mo mont nths hs. .
SLIDE 6
ABSTRACT
Simi mila lar lo losses o
- f i
ice t tong ngues i in Gr n Greenla nland nd ha have c caused s speed-u
- ups o
- f t
two t to t thr hree t time mes the he f flo low r rates i in ju n just o
- ne
ne y
- year. R
. Rapid c cha hang nges o
- ccurring
ng i in r n regions ns s surround nding ng Ant ntarctica a are c causing ng c conc ncern i n in t n the he p pola lar s scienc nce c commu mmuni nity t y to r research c h cha hang nges
- ccurring
ng i in c n coastal z l zone nes o
- ver t
time
- me. Du
. During ng t the he r research, t h, the he t team c m comple leted s study o y on n the he R Ross Ic Ice S She helf lf lo located o
- n t
n the he s south w h western c n coast o
- f t
the he A Ant
- ntarctic. T
. The he s study y inc nclu luded a a v vali lidation o n of t the he A ABSB v
- vs. t
. the he na natural b l basal s l stress b bound ndary ( y (NBSB) a alo long ng t the he Ross Ic Ice S She helf
- lf. T
. The he A ASAID B ID BSB w was c created i in 2 n 2003 b by a y a t team o m of r researche hers he headed b by y Nationa nal A l Aerona nautics a and nd S Space A Admi mini nistration Go n Goddard S Space F Fli light ht C Cent nter ( (NASA GS GSFC), w , with a h an a n aim o m of s studyi ying ng c coastal d l deviations ns a as i it p pertains ns t to t the he ma mass b bala lanc nce o
- f
the he e ent ntire c cont ntine nent
- nt. T
. The he p point nt d data f file le w was a aime med a at c creating ng a a r repli lica o
- f t
the he na natural l
- BSB. S
. Sele lect c clo loud f free L Land ndsat s satelli llite i ima magery f y from s m satelli llites 1 1 t thr hrough 7 h 7 w was u used t to detect c cha hang nges o
- ccurring
ng o
- ver t
the he s span o n of 1 19 y
- years. T
. The he la last ma majo jor i int nterest i in t n the he s study y inc nclu luded d docume ment nting ng t the he d deviations ns o
- r i
inc ncorrect p pla laceme ment nts o
- f t
the he A ABSB v
- vs. N
. NBSB. . ENVI 4 I 4.7 .7 a as w well a ll as E ENVI 5 I 5.0 .0 i ima mage ma mani nipula lation s n software w was u used i in t n the he g geo-r
- rectifyi
ying ng and nd t the he g geo-r
- referenc
ncing ng p
- process. C
. Cha hang nges t tha hat o
- ccurred w
were d docume ment nted i in t n the he f form m
- f a
a d data t table le w with t h the he c cha hang nge t tha hat o
- ccurred a
alo long ng w with t h the he la latitude a and nd lo long ngitude geographi hic c coordina nates. .
SLIDE 7
METHODOLOGY
- Id
Ident ntifyi ying ng t the he R Ross Ic Ice S She helf lf
- Locating
ng L Land ndsat i ima mages
- Shr
hrinki nking ng t the he t text f file le
- Converting
ng t text f file le t to a a v vector f file le
- Vali
lidation o n of t the he B Basal S l Stress B Bound ndary y
- Ge
Geo-r
- referenc
ncing ng t the he Ima Image
- Ima
Image W Warping ng
- Linki
nking ng Ima Images
- “Tracki
king ng De Deviations ns”
SLIDE 8
ROSS ICE SHELF
- Located i
in t n the he Southe heastern r n region o n of Ant ntarctica
- Path/
h/Row: 3 : 32/115, , 32/116, 3 , 30/116
SLIDE 9
LOCATING LANDSAT IMAGES
SLIDE 10
BASAL STRESS BOUNDARY TEXT FILE
Land Water
SLIDE 11
ERROR IN FILE SHRINKING
SLIDE 12
CONVERTING TO A VECTOR FILE
SLIDE 13
VALIDATION OF THE BASAL STRESS BOUNDARY
- Ima
Image a accuracy a y and nd r resolu lution ha n has i improved o
- ver t
time me
- Old
lder i ima mages ne needed a additiona nal p l processing ng
- Ima
Image w warping ng
SLIDE 14
GEO-REFERENCING THE IMAGE
- ENVI C
I Cla lassic a and nd E ENVI 5 I 5.0 .0
- Base i
ima mage: r : recent nt i ima mage
- Warp i
ima mage: o : old lder i ima mage
SLIDE 15
IMAGE WARPING
- Mini
nimu mum o m of 5 5 p point nts
- Ima
Images a are li link nked
- Simi
mila larities a are hi highli hlight hted
SLIDE 16
LINKING IMAGES
SLIDE 17
“TRACKING DEVIATIONS”
Land Water Land Water
SLIDE 18
2000 2014
SLIDE 19
1988 2014
SLIDE 20
CONCLUSION
- Observation s
n spanne nned a a t total o l of 2 25 y years
- Features i
ima mages b before a and nd a after t the he N NBSB w was di disco scovered ered
- Ut
Utili lized t the he s stand ndard z zoom o m of ~ ~x4 o
- f t
the he E ENVI C I Cla lassic zoom w m wind ndow f feature
- The
here ha had b been a n a mi mispla laceme ment nt o
- f t
the he N NBSB a alo long ng t the he ice s she helf lf
SLIDE 21
FUTURE WORK
- Add t
the he t text f file le a and nd v vector f file le i int nto o
- ne
ne f fold lder
- Fini
nish v h vali lidation o n of t the he R Ross Ic Ice S She helf lf i in t n the he Southw hwestern r n region n
SLIDE 22
ACKNOWLEDGEMENTS
- Micha
hael J l Jefferson J n Jr., M ., Ment ntor
- Dr
- Dr. L
. Lind nda B
- B. H
. Hayd yden, P n, Princ nciple le In Investigator
- CReSIS
IS
SLIDE 23