Controls on the composition and lability of dissolved organic matter in Siberia's Kolyma River basin

High-latitude northern rivers export globally significant quantities of dissolved organic carbon (DOC) to the Arctic Ocean. Climate change, and its associated impacts on hydrology and potential mobilization of ancient organic matter from permafrost, is likely to modify the flux, composition, and thus biogeochemical cycling and fate of exported DOC in the Arctic. This study examined DOC concentration and the composition of dissolved organic matter (DOM) across the hydrograph in Siberia's Kolyma River, with a particular focus on the spring freshet period when the majority of the annual DOC load is exported. The composition of DOM within the Kolyma basin was characterized using absorbance-derived measurements (absorbance coefficienta330, specific UV absorbance (SUVA254), and spectral slope ratio SR) and fluorescence spectroscopy (fluorescence index and excitation-emission matrices (EEMs)), including parallel factor analyses of EEMs. Increased surface runoff during the spring freshet led to DOM optical properties indicative of terrestrial soil inputs with high humic-like fluorescence, SUVA254, and low SRand fluorescence index (FI). Under-ice waters, in contrast, displayed opposing trends in optical properties representing less aromatic, lower molecular weight DOM. We demonstrate that substantial losses of DOC can occur via biological (∼30% over 28 days) and photochemical pathways (>29% over 14 days), particularly in samples collected during the spring freshet. The emerging view is therefore that of a more dynamic and labile carbon pool than previously thought, where DOM composition plays a fundamental role in controlling the fate and removal of DOC at a pan-Arctic scale

The Ursinus Weekly, March 17, 1952

MSGA reveals penalty plan for cheating • Campus presidential election by ballot planned Thursday • Seminar concludes with talk on philosophy of marriage • Sarah Canan named \u27Weekly editor; Richard Richter to be managing editor • Fireside chat planned by Y • Thespians to act in Penn Olympics • Chinese diplomat to speak at Forum Wednesday, April 2 • Courses listed for Summer term by Dean • Phila. Story leaders named • Dr. Carleton Coon tells Forum of cave explorations in Iran • Editorials: Heart of the matter; Some last words; Ike strengthened in N. H. • Letters to the editor • Y delegates attend meeting at U. of P. • Four Ursinus students visit United Nations meeting Friday • Juniors make final plans for variety show, Spring prom • Mr. Wilcox to read translations • Talk postponed • Students visit Vienna art display at museum • Whistler finally locates his trunk • Belles remain undefeated with victory over Temple • Huge crowd expected for intramural night • Swarthmore wins over tank team • Curtain falls over winter sports as wrestling ends • Veterans bolster track prospects • Baseballers begin Spring practice • Badminton team loses game to Swarthmore, 5-0, Thursday • Girls drop first game by one point to Penn • Brodbeck wins intramural title • Tennis team sets up player-ladder • Chemistry students plan conference • Eight men receive alternate bids by campus fraternitieshttps://digitalcommons.ursinus.edu/weekly/1538/thumbnail.jp

The Ursinus Weekly, October 15, 1951

Henning W. Prentis slated as speaker at Founders\u27 Day program, October 24 • Chaplain first Forum speaker on October 31 • Curtain Club adds sixty new members at annual party • New preceptress in charge of 646 Main • 300 books added to Library collection • Piano recital date moved to Nov. 8 • Cub and Key honor given to Jay Kern • Y plans weekend trip, arranges fireside chats • Date announced for civil service exam • WAA to sell socks, Christmas cards • Soph class plans year; Informal dance Nov. 3 • French Club discusses plans • Rev. Creager to speak • Juniors to sponsor G. E. House of Magic • German Club schedules trips and welcomes Inge Rudloff • 12 students become psychology majors • Spirit Committee fans campus enthusiasm • Editorials: No complaints; British voters go to polls; McCarthy vs. free speech • Letter to the editor • Dorm initiations give jokers a release • So the frosh love customs? Scribes of 1955 reveal all • Dr. Miller\u27s family hits high spots in European tour • Four teams open intradorm football • Hockey and soccer are overshadowed, but fortunately have excellent leaders • Dickinson hands Ursinus season\u27s second defeat • Dr. Roelofs keeps athletes in shape • Garnet eleven will play host to Bears Saturday • Alumnae team is undefeated; Faces Owlettes on Saturday • Harry Spangler succeeds Gerry Seeders as head coach of Ursinus court team • Bears defeated by Stevens Tech • Rittenhouse, Feldt to manage girls intramural program • Beardwood Chemical Society hears lecture on narcotics • Lit reading givenhttps://digitalcommons.ursinus.edu/weekly/1523/thumbnail.jp

The Ursinus Weekly, October 22, 1951

Seniors elect Paul Doughty new president • Full day planned for return of Old Timers • Weekly staff is enlarged by new members • Y retreat termed success; Varied program enjoyed • Chem group plans trip to exhibition • Ruby pictures slated • FTA plans roast for all members • Red Cross plans first aid, life saving courses for students • \u2755 show features night club life • 4 members added to Lantern staff • Chairmen named for junior events • Jobs offered • Scientific phenomena featured in magic show October 31 • Y cabinet makes new appointments • F&M demands no pre-game visitation • Editorials: New topics needed; British bar allusions • Letters to the editor • Alumni • Engagement • Identical twins revolt against heredity laws • Cutting classes requires skillful maneuvering and also fat purse • Ruth Reed goes to Venezuela for Y summer work • Ursinus meets Wagner on Homecoming day • Spying by Happy Chandler helped Centre top Harvard • Belles are victors in last 60 seconds as Rittenhouse scores winning goal • Glock paces Ursinus scorers • Curtis takes lead in interdorm loop • Bakermen lose to Rutgers, 5-4 • Grizzlies beat Swarthmore to gain football holiday • Swarthmore defeated in J.V. hockey, 5-4 • Pre-med society changes constitution; Election slated • WSGA secures dates for activities meetings during year • Debating explained • Meistersingers practice • Pre-legal drive opens • Chess club loseshttps://digitalcommons.ursinus.edu/weekly/1524/thumbnail.jp

The Ursinus Weekly, December 3, 1951

26 men join frats after rush week • Library used book sale begins today • Chem group lists water program • Light up the sky scores hit as first stage offering • Messiah features highly-rated soloists • Christmas plans made by WSGA; Lights needed • Private lives given as group production by new club members • English Club takes in new members • French Club plans party • Senior ball theme set for Friday • Y panel discusses army conscription • FTA to hear talk on teaching ways • Editorials: A pledge is a pledge; World discusses peace • Bob Herber describes room at University of Bristol, England • Senior prom themes remain centered about winter in past several years • Posters now made by freshmen girls for all activities • Supply Store improvements came with Navy moving to Ursinus campus during war years • Frank Merriwell saves the day • Jayvees defeat Penn; Have undefeated year • Graduating seniors vacate five positions on Ursinus soccer team • Swimming team loses one from last year\u27s squad • Eleven senior men bid farewell to college football playing careers • Albright defeats Curtis Hall team • Penn ties Belles in final contest • Miss Snell loses six hockey girls • Boyd to captain hockey squad in the 1952 season • Youth rally planned • Day students slate party • McClures to entertain • Concert listed • Students must return Ruby proofs by Fridayhttps://digitalcommons.ursinus.edu/weekly/1529/thumbnail.jp

The Ursinus Weekly, December 3, 1951

26 men join frats after rush week • Library used book sale begins today • Chem group lists water program • Light up the sky scores hit as first stage offering • Messiah features highly-rated soloists • Christmas plans made by WSGA; Lights needed • Private lives given as group production by new club members • English Club takes in new members • French Club plans party • Senior ball theme set for Friday • Y panel discusses army conscription • FTA to hear talk on teaching ways • Editorials: A pledge is a pledge; World discusses peace • Bob Herber describes room at University of Bristol, England • Senior prom themes remain centered about winter in past several years • Posters now made by freshmen girls for all activities • Supply Store improvements came with Navy moving to Ursinus campus during war years • Frank Merriwell saves the day • Jayvees defeat Penn; Have undefeated year • Graduating seniors vacate five positions on Ursinus soccer team • Swimming team loses one from last year\u27s squad • Eleven senior men bid farewell to college football playing careers • Albright defeats Curtis Hall team • Penn ties Belles in final contest • Miss Snell loses six hockey girls • Boyd to captain hockey squad in the 1952 season • Youth rally planned • Day students slate party • McClures to entertain • Concert listed • Students must return Ruby proofs by Fridayhttps://digitalcommons.ursinus.edu/weekly/1529/thumbnail.jp

The Ursinus Weekly, January 14, 1952

MSGA to enforce campus parking; new fines listed • Navy to send officer here for interviews • FTA hears lecture on visual aid subject • Dr. Phillips attends meeting of foreign student advisors • Forum speaker evaluates Middle East in address • May Queen petitions to go out Feb. 4; Pageant deadline set for February 27 • Rosicrucians add members; Tea is planned • Professors\u27 panel needs questions • Music Club picks Spring operetta • Interest lack hits debating society • Dolman to read • Music Club gives annual recital featuring students • Delta Pi Sigma pledges to work to improve campus • Re-election for Ruby business manager planned by Juniors • Editorials: Is it fair?; We still like heroes • Letters to the editor • English college rules differ from Ursinus\u27 • Engagement announced • Birth announced • Chess provides ground for exercise of mind\u27s caution, logic, memory • Projects planned for improvement of Y rec center • Boobies run acoustics in Bomberger • Bruins topple Haverford 76-59 for first league court victory • Wrestlers defeated by Lafayette team • Marguerite Spencer is chosen captain of 1952 girls\u27 basketball squad • Dorm squads battle for campus court crown • Mack assigned • Bruins register four pins to down Garnet matmen • New record set • Delaware beats Ursinus, 81-52 • Sorority members hold partieshttps://digitalcommons.ursinus.edu/weekly/1532/thumbnail.jp

The Ursinus Weekly, February 11, 1952

Lorelei set for Feb. 29th; Leigh\u27s Orchestra to play • 70 students on coveted B-list; 58 ineligible • Soph class to aid former member • Art instructions now offered by teacher • Curtain Club groups to stage two shows • Second marriage seminar planned Wednesday • May Day petitions due today • Pianist, violinist to play here in Bomberger concert • Weekly staff changes made • Lantern deadline set • Anne Hughes to speak at freshmen Color Day • 26 enroll as new students this semester • Barn dance set by Y Friday night • Dr. Yost makes TV debut in literature program • Tom Phillips elected new Ruby co-business manager • Communist poser to speak on experiences at Forum • Editorials: This was no flop; Elizabeth must provide symbol of solidarity for English people • Dr. Paisley named Layman of the Year • English university has 88 clubs; Atmosphere is international • Engagements • Chess Club JVs lose • Pfahler honored • Saporoschenko takes teaching assistantship at Washington University • Former Ursinus student is now busy recruiting for WAC in Norristown • Leap Year tactics are disclosed; Sirens have a heyday - males beware • Curtis and 724 lead league • Jayvees trounced by Lehigh Quintet, 78-43 • Robert Swett is honored by Philadelphia scribes • Haverford matmen beat Ursinus, 18-16 • Swarthmore defeats Junior varsity squad • Engineers win over Grizzlies • Garnet basketball team downed by Bruins, 69-61 • Snell\u27s Belles win basketball opener • Junior varsity girls basketball squad beats Swarthmore team • Pre-medders hear arthritis lecture • WSGA discusses plans for future events on calendar • Military chemistry subject of talk to students • WAA card party tonighthttps://digitalcommons.ursinus.edu/weekly/1533/thumbnail.jp

The Ursinus Weekly, October 8, 1951

Enrollment drops back; Freshman class contributes 163 students to 692 total • 2 more test for Selective Service set • Thespians invite new talent; Fall comedy selected • Martha Daniels, Jane Gulick elected new WSGA president, vice-president • Mrs. Pancoast is alumni secretary • Dates listed for graduate exams • Ruby editors choose department heads • Cup-o-coffee? Late breakfasts resume • WSGA discusses new business at meeting • Bio assistant named • Dr. Yost to present first English reading • Pair sentenced for violations • Lantern deadline set for Oct. 31; Associates sought • Editorials: To the Class of \u2755; World situation viewed • Y holds reception • Pre-med speakers • Engagement announced • Customs continue • Inge Rudloff arrives as reverse CARE package • Memories flee as students register • Same old story: Senior sage offers helpful advice to new and humble freshmen; (Many thanks, noble forefathers!) • Dragons defeat Ursinus in last twenty seconds • Don Kellett, famed grid star, led the Ursinus football eleven in 1938 • Marg Hooper leads 1951 hockey squad; Bakermen practice for soccer opener • Grizzlies gain first win by downing Fords, 20-7 • Jane Platt chosen phys-ed instructor • Graduate promotedhttps://digitalcommons.ursinus.edu/weekly/1522/thumbnail.jp